54. 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 12378521 (Canadian P/N 88901148) or equivalent to the threads.

2. Notice: Refer to Fastener Notice in Service Precautions.

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





3. Apply sealant GM P/N 12378521 (Canadian P/N 88901148) or equivalent to the plugs.
4. Install the (inner) oil gallery plugs.





5. Apply sealant GM P/N 12378521 (Canadian P/N 88901148) 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. Important: Lubricate the valve stems with clean engine oil before installing.

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.





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





10. Use J 8062 (2) and J 42037 (1) 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. Important: Do not try to centralize the electrode on the spark plug. The electrode is offset by design.

Install the spark plugs.
Tighten the spark plugs to 18 Nm (13 ft. lbs.).





16. Install the A.I.R. injection pipe gasket.
17. Install the A.I.R. injection pipe cover.
18. Install the A.I.R. injection pipe studs.
Tighten the studs to 25 Nm (18 ft. lbs.).