For 1990-2009 cars

Important: Keep the components sorted and organized so they can be installed in their original location.

1. Apply sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the valve rocker arm stud-to-cylinder head threads.

Apply the sealer to a minimum of 6 threads.

Notice: Refer to Fastener Notice in the Preface section.

2. Install the push rod guides and valve rocker arm studs onto the cylinder head.

Tighten
Tighten the valve rocker arm studs to 50 N·m (37 lb ft).

Important: The 8.1L engine uses different length intake and exhaust valve push rods. The exhaust valve push rods (2) are longer than the intake valve push rods (1).

3. Install the valve push rods.
4. Apply grease or clean engine oil to the valve rocker arm and valve rocker arm ball bearing surface.
5. Install the valve rocker arms, the valve rocker arm balls, and the valve rocker arm nuts.

Tighten
Tighten the valve rocker arm nuts slowly to 35 N·m (26 lb ft), while guiding the tips of the rocker arms over the tips of the valves.