50. Cylinder Head Assemble

Cylinder Head Assemble

^ Tools Required
- J 8062 Valve Spring Compressor
- J 42037 Valve Spring Compressor Adapter
- J 38820 Valve Stem Seal Remover/Installer





1. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads.

2. Install the (end) oil gallery plugs.
Tighten the oil gallery plugs to 38 Nm (28 ft. lbs.).

Notice: Refer to Fastener Notice in Service Precautions.






3. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the plugs.
4. Install the (inner) oil gallery plugs.





5. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the plug.
6. Install the water jacket plug.





7. Use J 38820 to install the valve seals. There is only one size valve seal.





8. Install the valves. 0.075 mm (0.003 inch) oversized valves are available if the valve guides needed to be reamed. Use the same (original size) valve seal.

Important: Lubricate the valve stems with clean engine oil before installing.






9. Install the valve spring and the valve spring retainer.





10. Use J 8062 and J 42037 to compress the valve spring.





11. Install the valve keys.
12. Remove J 8062 and J 42037.





13. Measure the valve installed height using a ruler. Measure from the base of the valve spring to the top of the valve.
14. Install the remaining valves, springs, and other components.





15. Install the spark plugs.

Important: Do not try to centralize the electrode on the spark plug. The electrode is offset by design.