Cylinder Head Assemble

Tools Required

• J 8062  Valve Spring Compressor. See Special Tools .
• J 9666  Valve Spring Tester
• J 43963  Valve Spring Compressor (off car). See Special Tools .

Fig 1: View Of Cylinder Head Plugs
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NOTE: 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 sealer GM P/N 12345382 (Canadian P/N 10953489) or equivalent.
Fig 2: Inspecting Valve Spring For Squareness
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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  . See Special Tools .
   • Any distorted springs should be replaced
Fig 3: Applying Prussian Blue
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4. Assemble the valves.
5. Use the following steps to measure valve runout:
   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.
   2. Clean all traces of Prussian blue.
   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.
Fig 4: Identifying Engine Valves
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6. Replace the valves, if required.
Fig 5: Installing Valve Seals
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7. Install the new valve seals. Fully seat the seals on the valve guides.
Fig 6: View Of Valve Springs
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8. Install the spring.
Fig 7: Identifying Valve Spring Retainers
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9. Install the retainer.
10. Using the J 8062  and the J 43963  , compress the valve spring. See Special Tools .
11. Install the valve keys.
12. Slowly release the J 8062  and the J 43963  from the valve/spring assembly. See Special Tools .
13. Inspect for proper valve key seating.
Fig 8: Measuring Valve Spring Installed Height
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14. Measure the valve installed height using a ruler. Measure from the base of the valve spring to the top of the valve. Refer to Engine Mechanical Specifications  for the correct specification.
15. Install the remaining valves, springs, and other components.
Fig 9: Identifying Cylinder Head Air Bleed Tube
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NOTE: Refer to Fastener Notice in Cautions and Notices.
16. Install the cylinder head air bleed tube.

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