12711770- L92 Cylinder Head Assembly

• Aluminum performance head
• Fits any LS family engine with 4.000" bore or larger
• 2.165" solid stem intake, and 1.590" solid stem exhaust valves
• .510" max valve lift
• As-cast L92 style intake ports
• D-shaped exhaust ports
• As-cast combustion chambers

Head P/N 12629064 is assembled with the following components:
12627970 Intake Valves
10166344 Valve Spring Retainers
12582719 Exhaust Valves
12482063 Intake Valve Stem Seals
12589774 Valve Springs
12482062 Exhaust Valve Stem Seals
10166345 Valve Locks

L92 Head Flow Data (4.000" Bore):
Lift         0.200" 0.300" 0.400" 0.500" 0.600"
Intake    151 208 256 294 316
Exhaust  111 152 174 183 189