Cylinder Head Assembly: Specifications

Cylinder Head Bolt Tightening Sequence:

- Apply thread sealer, GM part number 1052080 or equivalent on cylinder head bolt threads.
- This engine uses special torque to yield head bolts. This design bolt required a special tightening procedure. Failure to follow the given procedure will cause head gasket failure and possible engine damage.

1. Tighten bolts to 47 Nm (35 ft lbs.) in the sequence as shown.

Important: If torque reaches 88 Nm (65 ft. lbs.) at any time in steps 2 and 3, stop at this point. Do not complete the balance of the 90 degree turn.

2. Tighten each bolt 1/4 turn (90 degrees) in sequence.
3. Tighten each bolt an additional 1/4 (90 degrees) in sequence.