- Designed for any new Gen IV short-block with 4.000" bore or larger
- The 6-Bolt design is compatible with GM LSX and World LSX blocks
- Accepts Gen IV LS3 valvetrain and intake manifolds.
- Uses a 2.165" intake valve and 1.600" exhaust valve
- Has a 256cc intake port
- Has a 69cc combustion chamber standard
- Has a deck thickness of .750"
Each Mast Black Label cylinder head assembly includes:
- A fully CNC machined Mast Black Label aluminum cylinder head
- Mast micro finished .650 lift beehive valve springs
- Mast lightweight stainless steel intake & exhaust valves
- Mast lightweight steel retainers
- Mast machined locks
NOTE: Gaskets, valve covers, rocker arms and pushrods not included
Flow Data w/4.070" Bore Plate
Lift Intake Exhaust
0.100 77 56
0.200 148 118
0.300 237 165
0.400 295 208
0.500 328 227
0.600 351 235
0.700 370 241
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