Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
The left rear head bolt must be installed into the head prior to head installation. Coat the threads and heads of the head bolts with sealing compound (GM part #1052080 or equivalent) before installation. On 1988-95 models, tighten the head bolts in three stages: 20 ft. lbs. (25 Nm); 50 ft. lbs. (68 Nm) and finally, 1⁄4 or 90° turn more.
Fig. 10: Cylinder head bolt tightening sequence-6.5L engines