GM Service Manual Online
For 1990-2009 cars only

    Important: 

       • Do not use the valve rocker arm cover gasket again. Install a NEW gasket during assembly.
       • Remove the ignition coils before cleaning the cover in solvent. Do not submerge the ignition coils in solvent.
       • Do not remove the oil fill tube from the covers, unless service is required.

  1. Inspect the oil fill tube for a loose fit or damage.
  2. Inspect the covers for the following conditions:
  3. • Scoring or damage to the gasket surfaces
    • Ventilation system passages for restrictions
    • Threaded bolt holes for damage or debris