Installation (7.4L - 1999)

WARNING: This page is about a different variant/trim than selected.

NOTE: Do not reuse the cylinder head bolts. NEW cylinder head bolts must be used. The cylinder head bolts are torque-to-yield bolts and cannot be reused once the initial torque is applied. During the initial torque of the cylinder head bolt the cylinder head bolt is stretched to achieve proper clamp load. Proper clamp load will not be achieved if a used cylinder head bolt is torqued again. A stretched cylinder head bolt can also break when torqued. Failure to replace the used cylinder head bolts with NEW cylinder head bolts can lead to improper clamp loads and extensive engine damage.

IMPORTANT: The sealer must be applied to a minimum of eight threads starting at the point of the cylinder head bolt.

Clean gasket surfaces and bolt holes. Position NEW head gasket on cylinder block. Ensure all holes align. Coat NEW head bolt threads with GM Sealant (1052080). Install cylinder head with bolts finger-tight. Tighten head bolts in sequence to specification. in 4 passes. On first pass, tighten all bolts to 37 ft. lbs (50 N.m). On second pass, tighten bolts No. 1, 2, 3, 6, 7, 8, 9, 12, 14 and 15 an additional 150 degrees. On the third pass, tighten bolts No. 13 and 16 an additional 150 degrees. On the final pass, tighten bolts 4, 5, 10 and 11 an additional 90 degrees. See Figure. Lubricate the valve tip, rocker arm pivot and push rod socket with a high viscosity oil containing Zinc (1052367) or equivalent. To complete cylinder head installation, reverse removal procedure. Adjust the valves. See VALVE CLEARANCE ADJUSTMENT under ADJUSTMENTS.