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GM - 88958758- $1499
CNC PORTED LS3 CYLINDER HEADS FULLY ASSEMBLED (PAIR)
LS3 CNC-Ported Cylinder Head Assembly
• CNC-ported version of the LS3 cylinder head
• Flows about 10-percent more than the production head – more than 350 cfm (intake side) at .600" lift
• 276cc intake runners and 92cc exhaust ports
• Fits all LS engines with 4.000" bore or larger
• 2.165" hollow stem intake, and 1.590" solid stem exhaust valves
• .550" max valve lift
• D-shaped exhaust ports

Heads 12629063 and 88958758 assembled with the following: 12569427 Intake Valves 10166344 Valve Spring Retainers 12582719 Exhaust Valves 12482063 Intake Valve Stem Seals 12625033 Valve Springs 12482062 Exhaust Valve Stem Seals 10166345 Valve Locks
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