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Mast Motorsports Engine Block LSR - Concept Performance Aluminum Bare Block
Mast Motorsports Engine Block LSR - Concept Performance Aluminum Bare Block
Mast Motorsports Engine Block LSR - Concept Performance Aluminum Bare Block
Mast Motorsports Engine Block LSR - Concept Performance Aluminum Bare Block
Mast Motorsports Engine Block LSR - Concept Performance Aluminum Bare Block
Mast Motorsports Engine Block LSR - Concept Performance Aluminum Bare Block
$ 6,950.00

LSR - Concept Performance Aluminum Bare Block

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Only left in stock

LSR Block Features

1,500(+) HP Capable

  • 100% Made in USA
  • 356 T6 Premium Aluminum
  • Spun Ductile Iron Sleeves
  • Cross Braced Lifter Valley with Individual Drain Backs
  • 40% larger Main Cap Surface with a Double Crossbolt Option
  • Short or Tall deck blocks feature a Heavy Duty 0.750" deck thickness
  • Added Stock to the Front and Rear Valley Walls
  • Added 7th Transmission Bolt Hole to Accept Early Style GM Transmission
  • Maximized Cranksaddle Radius​
  • Front Oil Feed Line Can Be Restricted for Mechanical Lifter Options
  • 6 Bolt Cylinder Head Pattern
  • All OEM LSX parts such as covers, pans and accessories work seemlessly with the LSR

LSR Block Specs

  • Standard Deck:  9.240"
  • Tall Deck: 9.720
  • Bore Range: 4.065-4.190
  • Weight: 113lbs w/main caps
  • Billet Main Caps

 LSR Block Options

  • ARP Main Stud Options
  • Cam Bore Can Be Machined to Accept 60mm Roller Bearings
  • Lifter Bore can accept larger bore or key way style lifter
  • Double Cross Bolt Option- Increases to 8 Bolt Main
  • Solid Fill - No Water Jacket - Full Send Maximum Powa'

(LS) Standard Deck Options

  • Standard Deck - Single Cross Bolt                   PN LSR-SD10X
  • Standard Deck SOLID FILL                             PN LSR-FMJ-SD10X

(LS) Tall Deck Options (All Dual Main Cross Bolts)

  • Tall Deck - STD Cam Height                            PN LSR-TD2X
  • Tall Deck - Raised Cam Height                        PN LSR-TD2XRC
  • Tall Deck SOLID FILL - Standard Cam Height PN LSR-FMJ-TD2X
  • Tall Deck SOLID FILL - Raised Cam Height     PN LSR-FMJ-TD2XRC

(LT) Standard Deck

  • STD Deck, 6 Bolt LT Configuration                PN LTR-SD10X
****May not work with Direct Injection Please Check your application

 

This LTR features single 10mm ARP Cross Bolts, 10mm ARP Main Stud Kit, 11mm Head Stud Drilling, Priority Main Oiling, 1044 Billet Main Caps, Dura-bond GMP9 Cam Bearings, LSR Aluminum Rear Cover, a 1018/1020 Steel Cam Thrust Plate, and the accompanying LSR Hardware Kit. The LSR has an additional 0.020” left on the deck for final decking and an additional 0.003” left in crankshaft for the builder’s final hone. The camshaft and lifter bores are finished, honed and ready for precision bearings and lifters.