GM Service Manual Online
For 1990-2009 cars only
  1. Remove the 4 ignition coils.
  2. Remove the oil level gauge.
  3. Remove the positive crankcase ventilation (PCV) hose.
  4. Remove the PCV breather hose.

  5. Object Number: 464732  Size: SH
  6. Remove the 6 cap nuts and washers from the cylinder head.
  7. Remove the cylinder head cover (1).
  8. Remove the cylinder head cover gasket (2).
  9. Remove the 4 O-rings (3).