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General Motors — Remove differential housing mounting bolts from bracket (right side) and frame (left

A General Motors service procedure — check it applies to your exact model before use.

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Procedure

  1. On all engines, apply RTV sealant to front cover-to-cylinder block junction and rear
  2. On all engines, install oil pan. Tighten oil pan bolts to specification. See TORQUE
  3. Measure valve spring free length, installed height and pressure (tension). Replace valve
  4. Measure installed height between cylinder head spring seat (or top of shim, if
  5. Intake valve uses upper "O" ring seal and lower umbrella seal; exhaust valve uses
  6. When installing umbrella seal, seat seal against valve guide boss on cylinder head. Coat

Source: manual:1995 ENGINE 4.3L VIN W_text.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.