GM Service Manual Online
For 1990-2009 cars only

    Object Number: 177848  Size: SH
  1. Remove the secondary (spark plug) wire retaining clamps (2) from the valve rocker arm cover.
  2. Remove the valve rocker arm cover nuts and the seal washers that are located under the nuts.
  3. Remove the valve rocker arm cover (1) from the cylinder head.
  4. Remove the valve rocker arm cover gasket from the valve rocker arm cover.