5.3L Black Label | Assembled Pair of Cylinder Heads

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  • Regular price $ 3,900.00
  • 8 available
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Mast Motorsports LS1 5.3L Cathedral Port heads are designed for getting the most out of your 5.3L engine. If you are looking to make more power with your 5.3L LS, you have found the right head.

Dyno proven power.

Gain 37+hp with head swap ONLY, using stock truck intake.
Gain 100+hp with heads and cam swap, using STOCK truck intake!

With supporting upgrades this head will support 500hp+ on a naturally aspirated 5.3L.

  • Designed for any new Gen III or IV 5.3L engine.
  • Perfect for stroked 5.3L short blocks
  • Accepts Gen IV LS3 valvetrain, valves, & Cathedral Intake manifolds
  • Uses a 2.040" intake valve and 1.570" exhaust valve
  • 11 Degree Valve angle
  • Has a 62cc combustion chamber standard
  • Has a deck thickness of .750"
  • Cast & Machined in the USA!

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