Cylinder Head Bolt Tightening Sequence

Fig. 31 Cylinder head bolt tightening sequence:

1. On 1984 and early production 1985 engines, refer to tightening sequence, Fig. 31, and tighten cylinder head bolts in 3 steps as follows:
a. Torque all bolts to 30 ft. lbs.
b. Torque all bolts to 45 ft. lbs.
c. Tighten each bolt an additional 1/4 turn (90°).

During 1985 an 11 mm head bolt was introduced in production. This bolt can be identified by an ``11'' stamped on the bolt head. These bolts are used on late production 1985 engines and all 1986 - 87 engines. Do not intermix 10 and 11 mm head bolts, as stripping of threads or cracking of the block may result.

2. On late production 1985 and all 1986 - 87 engines, refer to tightening sequence, Fig. 31, and tighten cylinder head bolts in the 4 steps as follows:
a. Torque all bolts 45 ft. lbs.
b. Torque all bolts to 65 ft. lbs.
c. Torque all bolts again to 65 ft. lbs.
d. Tighten each bolt an additional 1/4 turn (90°), noting bolt torque. If bolt torque is not over 90 ft. lbs. after tightening an additional 1/4 turn, bolt should be replaced.