GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1224677  Size: SH
  1. Measure the valve spring height. Refer to Engine Mechanical Specifications. If the valve spring height does not match the specifications, replace the valve spring.

  2. Object Number: 2049765  Size: SH
  3. Measure the valve spring squareness. Refer to Engine Mechanical Specifications. If the valve spring squareness does not match the specifications, replace the valve spring.
  4. Inspect the valve spring seating surface of the valve rotators for wear or gouges. Replace as required.