Tools Required

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

1. Install the coolant air bleed hose fitting.

Tighten
Tighten the fitting 15 N·m (11 lb ft).





Notice: In order to avoid damage, install the spark plugs after the cylinder head has been installed on the engine.

2. Install NEW cylinder head plugs. Coat the plugs with Sealer GM P/N United States 12345382, GM P/N Canada 10953489, or equivalent.



3. Inspect the valve springs. Refer to Engine Mechanical Specifications for the tolerances.
4. Look for the following conditions when inspecting the valve springs:

•	Expanded height

•	Unparallel spring ends

•	Spring tension using J 9666

•	Any distorted springs should be replaced




5. Assemble the valves.
6. Use the following steps to measure valve runout:

6.1.	Apply a dab of Prussian blue on the entire valve face. Seat the valve but do not rotate it. The Prussian blue traces transferred to the valve seat are an indication of concentricity of the valve seat.

6.2.	Clean all traces of Prussian blue.

6.3.	Apply a dab of Prussian blue on the valve seat and repeat the check. The traces of Prussian blue transferred to the valve face indicates valve face concentricity.




7. Replace the valves, if required.



8. Install the new valve seals. Fully seat the seals on the valve guides.



9. Install the spring.



10. Install the retainer.
11. Using theJ 8062 and the J 43963 , compress the valve spring.
12. Install the valve keys.
13. Slowly release the J 8062 and the J 43963 from the valve/spring assembly.
14. Inspect for proper valve key seating.
15. Install the cylinder head air bleed tube.

Tighten
Tighten the bolts to 15 N·m (133 lb in).

Tools Required

Notice: In order to avoid damage, install the spark plugs after the cylinder head has been installed on the engine.

1. Install NEW cylinder head plugs. Coat the plugs with threadlocker P/N 21485277, or equivalent.



2. Inspect the valve springs. Refer to Engine Mechanical Specifications for the tolerances.
3. Look for the following conditions when inspecting the valve springs:

•	Expanded height

•	Unparallel spring ends

•	Spring tension using J 9666

•	Any distorted springs should be replaced




4. Assemble the valves.
5. Use the following steps to measure valve runout:

5.1.	Apply a dab of Prussian blue on the entire valve face. Seat the valve but do not rotate it. The Prussian blue traces transferred to the valve seat are an indication of concentricity of the valve seat.

5.2.	Clean all traces of Prussian blue.

5.3.	Apply a dab of Prussian blue on the valve seat and repeat the check. The traces of Prussian blue transferred to the valve face indicates valve face concentricity.

5.4.	Replace the valves, if required.




6. Lubricate the valve stems with engine oil supplement.
7. Install the valves.



8. Install the new valve seals. Fully seat the seals on the valve guides.



9. Install the spring.



10. Install the retainer.
11. Using theJ 8062 and the J 43963 , compress the valve spring.
12. Install the valve keys.
13. Slowly release the J 8062 and the J 43963 from the valve/spring assembly.
14. Inspect for proper valve key seating.

Notice: Refer to Fastener Notice in the Preface section.




15. Install the cylinder head air bleed tube.

Tighten
Tighten the bolts to 15 N·m (11 lb ft).