Chevrolet Performance 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 Valve Lift Intake Exhaust 0.200 151 111 0.300 208 152 0.400 256 174 0.500 294 183 0.600 316 189 Previous part numbers include: 12582713, 12615355, 12629064