G5 — CYLINDER BLOCK
For the G5.
Procedure
- Remove gasket material, rust, carbon, and other foreign material from top deck. Gasket surface must be clean.
- Use compressed air to remove all loose foreign material from cylinders and top deck.
- Clean all cylinder head mounting cap screw holes using JDG681 or an equivalent 9/16-12 UNC-2A tap about 88.9 mm (3.5 in.) long. Use compressed air to remove debris and any fluids which may be present in the cap screw holes.
- Measure top deck flat
Specs & torque values
- 88.9
- 3.5
Source: manual:Component Technical Manual 8.1L 6081 1994.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.