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. 💪
With supporting upgrades this head will support 500hp+ on a naturally aspirated 5.3L.
- Mast Rocker Stands required to run factory LS3 rocker arms
- 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!