GM Service Manual Online
For 1990-2009 cars only
  1. Clean the parts in solvent.
  2. • Wear protective safety glasses and gloves.
    • Blow-dry the parts with compressed air.
  3. Inspect the valve lifter guide plates and clamps for damage.
  4. Important: Some engines may have both standard and 0.010 inch oversize valve lifters. The oversize lifter will have a 10 etched on the side. Stamped on the cast pad next to the lifter bore and on the top rail of the cylinder case above the lifter bore will be the letters OS.

  5. Inspect the valve lifter rollers for fatigue or pitting. Replace the valve lifter as an assembly.
  6. Replace any damaged parts.