The CNC-ported LS3 head features 276cc intake runners and 92cc exhaust ports, along with a combustion chamber volume of about 68.5cc. That's the same volume as stock LS3 heads, which maintains the stock compression ratio. It will fit any LS engine with cylinder bores of 4.000 inches or larger, including 6.2L L92 truck engines.
Each head is delivered fully assembled, with 2.165-inch hollow-stem intake valves and 1.59-inch solid-stem exhaust valves, as well as valve springs, valve locks, spring retainers and valve stem seals. The maximum recommended valve lift with the stock valvetrain components is 0.550-inch.
Aluminum performance head
Fits any LS family engine with 4.00" bore or larger
2.165" hollow stem intake, and 1.59" solid stem exhaust valves
.570" max valve lift
CNC L92 style 276cc intake ports
D-shaped exhaust ports
CNC 68.5cc combustion chambers
Head 88958758 is assembled with the following components:
12569427 Intake Valves
10166344 Valve Spring Retainers
12582719 Exhaust Valves
12482063 Intake Valve Stem Seals
12586484 Valve Springs
12482062 Exhaust Valve Stem Seals
10166345 Valve Locks
NOTE: These are sold individually and will fit LH or RH side.