LS9 CNC Ported Cylinder Head Assembly 19433498

CNC-ported version of the LS9 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

Used with 12680072 Spark plugs