For 1990-2009 cars

1. Keep the valve lifters in order so they can be installed in their original position.

Important: When new valve lifters are installed, coat the valve lifters with camshaft and lifter prelube GM P/N United States 12345501, GM P/N Canada 992704 or the equivalent.

2. Inspect the following areas of the valve lifters:

• | The retaining clip (1)

• | The push rod socket for wear (2)

• | The valve lifter body for wear and scuffing (3)

• | The valve lifter bore for wear

• | The valve lifter roller assembly for wear (4)

• | The valve lifter roller pin for damage (5)

• | The oil hole for plugging (6)

3. Inspect the valve lifter guides for cracks or damage.