Cylinder Heads

The engine has 2 cylinder heads identified as the left bank (cylinders 2, 4, 6) and right bank (cylinders 1, 3, 5). Each cylinder head is cast in a light aluminum alloy and fastened to the cylinder block with non-reusable torque-to-yield bolts. The combustion chambers are hemispherical with 4 valves per cylinder and the spark plugs are located in the center. The intake and exhaust valves have chromium-plated stems. The exhaust valves are sodium filled for heat dissipation. The valve guides are pressed in the cylinder head and are not replaceable, but can be serviced by reaming the guides to an over-sized diameter and installing valves with over-sized stems.