General Motors — Cylinder Head Installation
Installation
From a General Motors service manual — check it applies to your exact model before use.
Procedure
- Clean gasket surfaces on block and cylinder head.
- Place head gasket over dowel pins with the bead up; no sealer on composition gasket.
- Guide cylinder head into place over dowel pins and gasket.
- Coat cylinder head bolt threads with Loctite #592 or equivalent; install finger tight.
- Torque bolts in three steps in sequence: 35, 60, 90 N-m (5.0L/5.7L).
- Torque bolts in three steps in sequence: 40, 80, 115 N-m (7.4L).
Specs & values
- 5.0L/5.7L: first sequence 35 N-m (25 lbs ft); second 60 N-m (45 lbs ft); final 90 N-m (65 lbs ft)
- 7.4L: first sequence 40 N-m (30 lbs ft); second 80 N-m (60 lbs ft); final 115 N-m (85 lbs ft)
Source: General Motors service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.