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General Motors — Service Procedure

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

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Procedure

  1. Intake valve uses upper "O" ring seal and lower umbrella seal; exhaust valve uses
  2. When installing umbrella seal, seat seal against valve guide boss on cylinder head. Coat

Specs & torque values

  • Replace valve if margin is less than .031" (.8 mm).

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.