Mast Motorsports LS3 LSA 255 Black Label heads are designed for getting the most out of your LS3 or LSA engine. If you are looking to make more power with your LS3 or LSA, you have found the right head.
💪 Dyno proven power. 💪
With supporting upgrades this head will support 600hp+ on a naturally aspirated LS3.
- Designed for any Gen III or IV 4.000" Bore short block.
- Perfect for stroked LS3 short blocks
- Accepts Gen IV LS3 valvetrain, valves, & LS3 Intake manifolds
- Uses a 2.165" intake valve and 1.600" exhaust valve
- 11 Degree Valve angle
- Has a 69cc combustion chamber standard
- Has a deck thickness of .750"
- Cast & Machined in the USA!