{"title":"Memorial Day Sale 2026","description":"","products":[{"product_id":"ls3-factory-mast-head-255-bare","title":"LS3 Medium Bore | Factory Mast | As Cast Port | Cylinder Head - Single Bare","description":"\u003ch2 data-mce-fragment=\"1\"\u003e\u003cstrong\u003eExpected Ship Date February 2025\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cb style=\"background-color: #ffff00;\"\u003e----\u0026gt;\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/LS3AsCastMediumBoreSpecSheet-Final_1.pdf?v=1699646045\"\u003eDownload the Cylinder Head Spec Sheet\u003c\/a\u003e\u0026lt;----\u003c\/b\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cb style=\"background-color: #ffff00;\"\u003e----\u0026gt; \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/Factory_Mast_Medium_Bore_LS3_Cylinder_Head_Test.pdf?v=1692736200\" rel=\"noopener\" target=\"_blank\"\u003eDownload the Dyno Report\u003c\/a\u003e \u0026lt;----\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIntroducing the Factory Mast \"As Cast\" Port Cylinder Head.                                           \u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWe launched our Factory Mast product line to deliver an economical product line for our customers. \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWe completely engineered and manufactured our long standing best in class CNC port into an \"As Cast\" port.  This new process saves a significant amount of time and manufacturing cost, which is savings we pass down to you.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eYou have come to love the \"Black Label\" Cylinder heads, but now you can get the same quality at a lower price without\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSACRIFICING\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eperformance.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eManufactured using permanent mold technology, this casting is simply an amazing surface finish and quality.  \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eMast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality.  When buying Mast Cylinder heads, you are getting the highest level of quality and performance on the market. \u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFull Send, no compromises, no shortcuts, ever.\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003cem\u003e4.000 (+)\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eWeight:\u003c\/strong\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e 28.5 \u003c\/span\u003elbs.\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIntake Valve Size:\u003c\/span\u003e \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e2.165\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.600\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Stem Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5\/16\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Length:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5.450\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Angle:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e11\u003c\/em\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e°\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Pocket Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.580\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Install Height:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e1.800\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Stud Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e.4375\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Guide OD: \u003c\/strong\u003e\u003cem\u003e.502\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Job Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eAs Cast\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eAir Flow \u0026amp; Performance Criteria\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eIntake Max. Flow: \u003c\/strong\u003e358 CFM @ 7.000\"\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eExhaust Max. Flow: \u003c\/strong\u003e\u003cem\u003e230 CFM @ 7.000:\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Average Flow:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e236 CFM\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Average Flow:\u003c\/strong\u003e \u003ci\u003e160 CFM\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Seat Material: \u003c\/strong\u003e\u003cem\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Port Volume: \u003c\/strong\u003e\u003ci\u003e255cc\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Port Volume:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003ci\u003e106cc\u003c\/i\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eStandard Chamber Volume:\u003c\/strong\u003e \u003cem data-mce-fragment=\"1\"\u003e70cc\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cem data-mce-fragment=\"1\"\u003e\u003c\/em\u003e\u003cstrong data-mce-fragment=\"1\"\u003ePort Type:\u003c\/strong\u003e \u003cem\u003eAs \u003c\/em\u003e\u003ci\u003eCast\u003c\/i\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eMaterials\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCylinder Head Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eA356-T6 Aluminum\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Valve Seat Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Seat Material:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eDeck Thickness:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e.750\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Arm Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem data-mce-fragment=\"1\"\u003eOE LS7 1.8 or Aftermarket\u003c\/em\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eGuide Material:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e Bronze\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eGeneral\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stands Included:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Dowels Included: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eUses Stock Rocker Bolts:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Bolts Included:\u003c\/strong\u003e \u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Arm Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eOE LS3 1.7 or Aftermarket\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Bolt QTY: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e6 Bolt Style\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Cover Rail Height:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e+ ½ inch\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCan use OE Valve Cover: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eCustom Options Available\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eCustom Chamber Size\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eChamber Softening\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003e1\/2\" Head Studs\u003c\/i\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Mast Motorsports","offers":[{"title":"Default Title","offer_id":42445781074133,"sku":"CH-LSX-302447","price":1049.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/products\/factory-mast-cylinder-heads-ls3-medium-bore-factory-mast-as-cast-port-cylinder-head-single-bare-37959047676117.png?v=1691759507"},{"product_id":"ls3-factory-mast-head-255","title":"LS3 Medium Bore | Factory Mast | As Cast Port | Cylinder Head - Pair","description":"\u003ch2 data-mce-fragment=\"1\"\u003e\u003cstrong\u003eExpected Ship Date February 2025\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cb style=\"background-color: #ffff00;\"\u003e----\u0026gt;\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/LS3AsCastMediumBoreSpecSheet-Final_1.pdf?v=1699646045\"\u003eDownload the Cylinder Head Spec Sheet\u003c\/a\u003e\u0026lt;----\u003c\/b\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cb style=\"background-color: #ffff00;\"\u003e----\u0026gt; \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/Factory_Mast_Medium_Bore_LS3_Cylinder_Head_Test.pdf?v=1692736200\" rel=\"noopener\" target=\"_blank\"\u003eDownload the Dyno Report Here\u003c\/a\u003e \u0026lt;----\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan\u003eIntroducing the Factory Mast \"As Cast\" Port Cylinder Head.                                           \u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWe launched our Factory Mast product line to deliver an economical product line for our customers. \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWe completely engineered and manufactured our long standing best in class CNC port into an \"As Cast\" port.  This new process saves a significant amount of time and manufacturing cost, which is savings we pass down to you.\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eYou have come to love the \"Black Label\" Cylinder heads, but now you can get the same quality at a lower price without\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSACRIFICING\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eperformance.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eManufactured using permanent mold technology, this casting is simply an amazing surface finish and quality.  \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eMast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality.  When buying Mast Cylinder heads, you are getting the highest level of quality and performance on the market. \u003cbr\u003e\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFull Send, no compromises, no shortcuts, ever.\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eDimensional Specs\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003cem\u003e4.000 (+)\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eWeight:\u003c\/strong\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e 28.5 \u003c\/span\u003elbs.\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIntake Valve Size:\u003c\/span\u003e \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e2.165\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.600\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Stem Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5\/16\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Length:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5.450\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Angle:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e11\u003c\/em\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e°\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Pocket Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.580\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Install Height:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e1.800\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Stud Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e.4375\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Guide OD: \u003c\/strong\u003e\u003cem\u003e.502\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Job Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eAs Cast\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eAir Flow \u0026amp; Performance Criteria\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eIntake Max. Flow: \u003c\/strong\u003e358 CFM @ 7.000\"\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eExhaust Max. Flow: \u003c\/strong\u003e\u003cem\u003e230 CFM @ 7.000:\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Average Flow: \u003c\/strong\u003e236 CFM\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Average Flow:\u003c\/strong\u003e \u003ci\u003e160 CFM\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Seat Material: \u003c\/strong\u003e\u003cem\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Port Volume: \u003c\/strong\u003e\u003cem\u003e255cc\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Port Volume:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e106cc\u003c\/em\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eStandard Chamber Volume:\u003c\/strong\u003e \u003cem data-mce-fragment=\"1\"\u003e70cc\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cem data-mce-fragment=\"1\"\u003e\u003c\/em\u003e\u003cstrong data-mce-fragment=\"1\"\u003ePort Type:\u003c\/strong\u003e \u003cem\u003eAs \u003c\/em\u003e\u003ci\u003eCast\u003c\/i\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eMaterials\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCylinder Head Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eA356-T6 Aluminum\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Valve Seat Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Seat Material:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eDeck Thickness:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e.750\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Arm Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem data-mce-fragment=\"1\"\u003eOE LS3 1.7 or Aftermarket\u003c\/em\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eGuide Material:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e Bronze\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eGeneral\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stands Included:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Dowels Included: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eUses Stock Rocker Bolts:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Bolts Included:\u003c\/strong\u003e \u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Arm Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eOE LS3 1.7 or Aftermarket\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Bolt QTY: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e6 Bolt Style\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Cover Rail Height:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e+ ½ inch\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCan use OE Valve Cover: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eCustom Options Available\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci data-mce-fragment=\"1\"\u003eHead Assembly\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eCustom Chamber Size\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eChamber Softening\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003e1\/2\" Head Studs\u003c\/i\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Mast Motorsports","offers":[{"title":"Default Title","offer_id":42445781205205,"sku":"CH-LSX-302451","price":2049.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/products\/factory-mast-cylinder-heads-ls3-medium-bore-factory-mast-as-cast-port-cylinder-head-pair-w-valves-37959034011861.png?v=1657678370"},{"product_id":"copy-of-ls3-medium-bore-factory-mast-cnc-ported-cylinder-head-single-bare","title":"5.3L Cathedral Small Bore | Factory Mast | As Cast | Cylinder Head - Single Bare","description":"\u003ch1 data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/h1\u003e\n\u003cp class=\"p1\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/Small_Bore_5.3L_Cathedral_Tech_Flyer.pdf?v=1701287668\" title=\"5.3L Small Bore Factory Mast Cylinder Head\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e***Download the Tech Sheet Here***\u003c\/strong\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eWe launched our Factory Mast product line to deliver an economical product line for our customers. \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eYou have come to love the \"Black Label\" Cylinder heads, but now you can get the same quality at a lower price without\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSACRIFICING\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eperformance.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eManufactured using permanent mold technology, this casting is simply an amazing surface finish and quality.  \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eMast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality.  When buying Mast Cylinder heads, you are getting the highest level of quality and performance on the market. \u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFull Send, no compromises, no shortcuts, ever.\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eDimensional Specs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e\u003cspan\u003e \u003cem\u003e3.78\u003c\/em\u003e\u003c\/span\u003e\u003cem\u003e0 (+)\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eWeight:\u003c\/strong\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e 28.5 \u003c\/span\u003elbs.\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIntake Valve Size:\u003c\/span\u003e \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e2.040\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.570\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Stem Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5\/16\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Length:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5.450\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Angle:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e11\u003c\/em\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e°\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Pocket Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.580\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Install Height:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e1.800\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Stud Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e.4375\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Guide OD: \u003c\/strong\u003e0\u003cem\u003e.565\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Job Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5 Angle\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eAir Flow \u0026amp; Performance Criteria\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eIntake Max. Flow: \u003c\/strong\u003e\u003cem\u003e312 CFM @ 6.000\"\u003c\/em\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eExhaust Max. Flow: \u003c\/strong\u003e\u003cem\u003e223 CFM @ 8.000\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Average Flow:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e229 CFM\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Average Flow:\u003c\/strong\u003e \u003cem\u003e168 CFM\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Seat Material: \u003c\/strong\u003e\u003cem\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Port Volume: \u003c\/strong\u003e\u003ci\u003e256cc\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Port Volume:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e99\u003c\/em\u003e\u003ci\u003ecc\u003c\/i\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eStandard Chamber Volume:\u003c\/strong\u003e \u003cem\u003e64cc\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cem data-mce-fragment=\"1\"\u003e\u003c\/em\u003e\u003cstrong data-mce-fragment=\"1\"\u003ePort Type:\u003c\/strong\u003e \u003ci\u003eAs Cast\u003c\/i\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eMaterials\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCylinder Head Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eA357-T6 Aluminum\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Valve Seat Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Seat Material:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eDeck Thickness:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e.750\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eGuide Material:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e Bronze\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eGeneral\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stands Included:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Dowels Included: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eUses Stock Rocker Bolts:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Bolts Included:\u003c\/strong\u003e \u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Arm Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eOE LS3 1.7 or Aftermarket\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Bolt QTY: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e6 Bolt Style\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Cover Rail Height:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e+ ½ inch\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCan use OE Valve Cover: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eCustom Options Available\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eCustom Chamber Size\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eChamber Softening\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003e1\/2\" Head Studs\u003c\/i\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Mast Motorsports","offers":[{"title":"Default Title","offer_id":45219771056341,"sku":"CH-LSX-302446","price":1049.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/mast-motorsports-cylinder-heads-5-3l-cathedral-small-bore-factory-mast-as-cast-cylinder-head-single-bare-1175624401.png?v=1751061870"},{"product_id":"copy-of-ls3-medium-bore-factory-mast-cnc-ported-cylinder-head-pair-w-valves","title":"5.3L Cathedral Small Bore | Factory Mast | As Cast | Cylinder Head - Pair","description":"\u003cp data-mce-fragment=\"1\"\u003e\u003ca title=\"Small Bore 5.3L Factory Mast Cylinder Head\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/Small_Bore_5.3L_Cathedral_Tech_Flyer.pdf?v=1701287668\"\u003e\u003cspan\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e***Download the Tech Sheet Here*** \u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWe launched our Factory Mast product line to deliver an economical product line for our customers. \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eYou have come to love the \"Black Label\" Cylinder heads, but now you can get the same quality at a lower price without\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSACRIFICING\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eperformance.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eManufactured using permanent mold technology, this casting is simply an amazing surface finish and quality.  \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eMast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality.  When buying Mast Cylinder heads, you are getting the highest level of quality and performance on the market. \u003cbr\u003e\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFull Send, no compromises, no shortcuts, ever.\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eDimensional Specs\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e\u003cspan\u003e \u003cem\u003e3.78\u003c\/em\u003e\u003c\/span\u003e\u003cem\u003e0 (+)\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eWeight:\u003c\/strong\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e 28.5 \u003c\/span\u003elbs.\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIntake Valve Size:\u003c\/span\u003e \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e2.040\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.570\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Stem Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5\/16\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Length:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5.450\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Angle:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e11\u003c\/em\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e°\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Pocket Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.580\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Install Height:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e1.800\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Stud Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e.4375\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Guide OD:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e0\u003cem\u003e.565\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Job Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5 Angle\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eAir Flow \u0026amp; Performance Criteria\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eIntake Max. Flow: \u003c\/strong\u003e\u003cem\u003e312 CFM @ 6.000\"\u003c\/em\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eExhaust Max. Flow: \u003c\/strong\u003e\u003cem\u003e223 CFM @ 8.000\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Average Flow:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e229 CFM\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Average Flow:\u003c\/strong\u003e \u003cem\u003e168 CFM\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Seat Material: \u003c\/strong\u003e\u003cem\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Port Volume:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003ci\u003e256cc\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Port Volume:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e99\u003c\/em\u003e\u003ci\u003ecc\u003c\/i\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eStandard Chamber Volume:\u003c\/strong\u003e \u003cem\u003e64cc\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cem data-mce-fragment=\"1\"\u003e\u003c\/em\u003e\u003cstrong data-mce-fragment=\"1\"\u003ePort Type:\u003c\/strong\u003e \u003ci\u003eAs Cast Cathedral\u003c\/i\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eMaterials\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCylinder Head Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eA357-T6 Aluminum\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Valve Seat Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Seat Material:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eDeck Thickness:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e.750\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eGuide Material:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e Bronze\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eGeneral\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stands Included:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Dowels Included: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eUses Stock Rocker Bolts:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Bolts Included:\u003c\/strong\u003e \u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Arm Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eOE LS3 1.7 or Aftermarket\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Bolt QTY: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e6 Bolt Style\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Cover Rail Height:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e+ ½ inch\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCan use OE Valve Cover: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eCustom Options Available\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci data-mce-fragment=\"1\"\u003eHead Assembly\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eCustom Chamber Size\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eChamber Softening\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003e1\/2\" Head Studs\u003c\/i\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Mast Motorsports","offers":[{"title":"Default Title","offer_id":45219864346837,"sku":"CH-LSX-302450","price":2049.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/mast-motorsports-cylinder-heads-5-3l-cathedral-small-bore-factory-mast-as-cast-cylinder-head-single-bare-1175624401.png?v=1751061870"},{"product_id":"copy-of-cathedral-ls3-small-bore-factory-mast-as-cast-cylinder-head-single-bare","title":"The Mast Minotaur | 5.3\/LS3 Small Bore | Factory Mast | As Cast | Cylinder Head - Single Bare","description":"\u003cp class=\"p1\"\u003eIntroducing one of the first 5.3 Liter LS3 cylinder heads designed for use with the LS3 intake without adapters. Optimized for 3.780 bore diameter.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/Mast_Minotaur_Tech_Flyer.pdf?v=1701290472\" title=\"Factory Mast Cathedral\/LS3 Small Bore Cylinder Head\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e***Download the Tech Sheet Here***\u003c\/strong\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eWe launched our Factory Mast product line to deliver an economical product line for our customers. \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eYou have come to love the \"Black Label\" Cylinder heads, but now you can get the same quality at a lower price without\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSACRIFICING\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eperformance.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eManufactured using permanent mold technology, this casting is simply an amazing surface finish and quality.  \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eMast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality.  When buying Mast Cylinder heads, you are getting the highest level of quality and performance on the market. \u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFull Send, no compromises, no shortcuts, ever.\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eDimensional Specs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e\u003cspan\u003e \u003cem\u003e3.78\u003c\/em\u003e\u003c\/span\u003e\u003cem\u003e0 (+)\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eWeight:\u003c\/strong\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e 28.5 \u003c\/span\u003elbs.\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIntake Valve Size:\u003c\/span\u003e \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e2.040\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.570\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Stem Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5\/16\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Length:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5.450\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Angle:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e11\u003c\/em\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e°\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Pocket Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.580\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Install Height:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e1.800\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Stud Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e.4375\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Guide OD: \u003c\/strong\u003e\u003cem\u003e0.565\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Job Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5 Angle\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eAir Flow \u0026amp; Performance Criteria\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eIntake Max. Flow: \u003c\/strong\u003e\u003cem\u003e312 CFM @ 6.000\"\u003c\/em\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eExhaust Max. Flow: \u003c\/strong\u003e\u003cem\u003e220 CFM @ 8.000\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Average Flow:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e228 CFM\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Average Flow:\u003c\/strong\u003e \u003cem\u003e168 CFM\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Seat Material: \u003c\/strong\u003e\u003cem\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Port Volume: \u003c\/strong\u003e\u003ci\u003e246cc\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Port Volume:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e99\u003c\/em\u003e\u003ci\u003ecc\u003c\/i\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eStandard Chamber Volume:\u003c\/strong\u003e \u003cem\u003e64cc\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cem data-mce-fragment=\"1\"\u003e\u003c\/em\u003e\u003cstrong data-mce-fragment=\"1\"\u003ePort Type:\u003c\/strong\u003e \u003ci\u003eAs Cast\u003c\/i\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eMaterials\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCylinder Head Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eA357-T6 Aluminum\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Valve Seat Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Seat Material:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eDeck Thickness:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e.750\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eGuide Material:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e Bronze\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eGeneral\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stands Included:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Dowels Included: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eUses Stock Rocker Bolts:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Bolts Included:\u003c\/strong\u003e \u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Arm Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eOE LS3 1.7 or Aftermarket\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Bolt QTY: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e6 Bolt Style\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Cover Rail Height:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e+ ½ inch\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCan use OE Valve Cover: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eCustom Options Available\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eCustom Chamber Size\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eChamber Softening\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003e1\/2\" Head Studs\u003c\/i\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Mast Motorsports","offers":[{"title":"Default Title","offer_id":45220106436821,"sku":"CH-LSX-302529","price":1049.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/mast-motorsports-cylinder-heads-stainless-steel-valves-5-3-ls3-small-bore-factory-mast-as-cast-cylinder-head-pair-w-valves-1175624400.png?v=1774294389"},{"product_id":"copy-of-5-3l-cathedral-small-bore-factory-mast-as-cast-cylinder-head-pair-w-valves","title":"The Mast Minotaur | 5.3\/LS3 Small Bore | Factory Mast | As Cast | Cylinder Head - Pair","description":"\u003cp class=\"p1\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cem\u003eIntroducing one of the first 5.3 Liter LS3 cylinder heads designed for use with the LS3 intake without adapters. Optimized for 3.780 bore diameter.\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/Mast_Minotaur_Tech_Flyer.pdf?v=1701290472\" title=\"Cathedral\/LS3 Small Bore Factory Mast Cylinder Head\"\u003e\u003cspan\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003e***Download the Tech Sheet Here*** \u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWe launched our Factory Mast product line to deliver an economical product line for our customers. \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eYou have come to love the \"Black Label\" Cylinder heads, but now you can get the same quality at a lower price without\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSACRIFICING\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eperformance.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eManufactured using permanent mold technology, this casting is simply an amazing surface finish and quality.  \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eMast refuses to compromise on materials and methods that may jeopardize longevity, performance, and quality.  When buying Mast Cylinder heads, you are getting the highest level of quality and performance on the market. \u003cbr\u003e\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFull Send, no compromises, no shortcuts, ever.\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eDimensional Specs\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e\u003cspan\u003e \u003cem\u003e3.78\u003c\/em\u003e\u003c\/span\u003e\u003cem\u003e0 (+)\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eWeight:\u003c\/strong\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e 28.5 \u003c\/span\u003elbs.\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIntake Valve Size:\u003c\/span\u003e \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e2.040\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.570\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Stem Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5\/16\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Length:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5.450\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Angle:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e11\u003c\/em\u003e\u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e°\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Pocket Diameter:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e1.580\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Spring Install Height:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e1.800\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Stud Size:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e.4375\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Guide OD:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e0\u003cem\u003e.565\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Job Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e5 Angle\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eAir Flow \u0026amp; Performance Criteria\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eIntake Max. Flow: \u003c\/strong\u003e\u003cem\u003e312 CFM @ 6.000\"\u003c\/em\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong\u003eExhaust Max. Flow: \u003c\/strong\u003e\u003cem\u003e223 CFM @ 8.000\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Average Flow:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e229 CFM\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Average Flow:\u003c\/strong\u003e \u003cem\u003e168 CFM\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Seat Material: \u003c\/strong\u003e\u003cem\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Port Volume:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003ci\u003e256cc\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Port Volume:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem\u003e99\u003c\/em\u003e\u003ci\u003ecc\u003c\/i\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eStandard Chamber Volume:\u003c\/strong\u003e \u003cem\u003e64cc\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cem data-mce-fragment=\"1\"\u003e\u003c\/em\u003e\u003cstrong data-mce-fragment=\"1\"\u003ePort Type:\u003c\/strong\u003e \u003ci\u003eAs Cast\u003c\/i\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eMaterials\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCylinder Head Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eA357-T6 Aluminum\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eIntake Valve Seat Material:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eExhaust Valve Seat Material:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003cem data-mce-fragment=\"1\"\u003eHigh Chrome Alloy Steel\u003c\/em\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eDeck Thickness:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e.750\"\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eGuide Material:\u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e Bronze\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eGeneral\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Type:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eMast Billet\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stands Included:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Stand Dowels Included: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eUses Stock Rocker Bolts:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Bolts Included:\u003c\/strong\u003e \u003cem data-mce-fragment=\"1\"\u003eNo\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eRocker Arm Type: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eOE LS3 1.7 or Aftermarket\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eHead Bolt QTY: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003e6 Bolt Style\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eValve Cover Rail Height:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cem data-mce-fragment=\"1\"\u003e+ ½ inch\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eCan use OE Valve Cover: \u003c\/strong\u003e\u003cem data-mce-fragment=\"1\"\u003eYes\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cu data-mce-fragment=\"1\"\u003eCustom Options Available\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci data-mce-fragment=\"1\"\u003eHead Assembly\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eCustom Chamber Size\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003eChamber Softening\u003c\/i\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ci\u003e1\/2\" Head Studs\u003c\/i\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Mast Motorsports","offers":[{"title":"Default Title","offer_id":45220171088085,"sku":"CH-LSX-302530","price":2049.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/1701\/files\/mast-motorsports-cylinder-heads-stainless-steel-valves-5-3-ls3-small-bore-factory-mast-as-cast-cylinder-head-pair-w-valves-1175624400.png?v=1774294389"}],"url":"https:\/\/www.mastmotorsports.com\/collections\/memorial-day-sale-2026.oembed","provider":"Mast Motorsports","version":"1.0","type":"link"}