HomeRepair guidesCYLINDER BLOCK

G5 — CYLINDER BLOCK

For the G5.

Procedure

  1. Remove gasket material, rust, carbon, and other foreign material from top deck. Gasket surface must be clean.
  2. Use compressed air to remove all loose foreign material from cylinders and top deck.
  3. 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.
  4. 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.