Chevrolet Performance 19433498 - 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.