For 1990-2009 cars

1. Install the hydraulic lash adjusters into their bores in the cylinder head. Apply lubricant GM P/N 12345501 (Canadian P/N 992704) or equivalent.
2. Lubricate the valve tips with GM P/N 12345501 (Canadian P/N 992704) or equivalent.

Important: Used roller followers must be returned to the original position on the camshaft. If the camshaft is being replaced, the roller followers actuated by the camshaft must also be replaced.

3. Position the roller followers on the tip of the valve stem and on the lash adjuster, apply lubricant GM P/N 12345501 (Canadian P/N 992704) or equivalent.
4. Set the exhaust camshaft on top of the roller followers in the camshaft journals. Lubricate with GM P/N 12345501 (Canadian P/N 992704) or equivalent.
5. Install the camshaft caps and hand start the camshaft cap bolts.

Notice: Refer to Fastener Notice in the Preface section.

6. The timing chain sprocket alignment notch should be oriented to the 2 o' clock position.
7. Tighten the camshaft bearing cap bolts in increments of 3 turns until they are seated, lubricate.

Tighten
Tighten the camshaft caps to 10 N·m (89 lb in).