12675871 LS3 Cylinder Head Assembly, Replaces 12629063

- Aluminum performance head
- Fits any LS family engine with 4.000" bore or larger
- 2.165" hollow stem intake, and 1.590" solid stem exhaust valves
- .570" max valve lift
- As-cast L92 style intake ports
- D-shaped exhaust ports
- As-cast combustion chambers
- Uses bare head P/N 12629051


Heads 12675871 are assembled with the following components:
12569427 Intake Valves
10166344 Valve Spring Retainers
12582719 Exhaust Valves
12482063 Intake Valve Stem Seals
12625033 Valve Springs
12482062 Exhaust Valve Stem Seals
10166345 Valve Locks