LS9 CNC-Ported Cylinder Head Assembly w/LS3 Valves

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