For 1990-2009 cars

1. Keep the valve lifters in order so that they may be installed in their original position.
2. If the lifters are removed, install them in their original position.

Important: When new valve lifters are installed, coat the valve lifters with camshaft and lifter prelube GM P/N 1052365 (or equivalent).

3. Inspect the following areas of the lifters:

• | The lifter body for wear and scuffing

• | The lifter bore for wear

4. Inspect the valve rocker arms for wear at the rotation surfaces.