For 1990-2009 cars

1. Install NEW valve rocker arm cover grommets and use NEW valve rocker arm cover bolts if they are serviced with the grommet.

Important:

• | All gasket-mating surfaces need to be free of oil and foreign material. Use GM P/N 12378392 or equivalent to clean surfaces.

• | Apply sealant GM P/N 12378521 (Canadian P/N 88901148) or equivalent at the cylinder head to lower intake manifold joint.

2. Install a NEW gasket to the valve rocker arm cover. Ensure that the gasket is properly seated in the groove of the valve rocker arm cover.
3. Apply sealant GM P/N 12378521, (Canadian P/N 88901148) or the equivalent to the joint surfaces (1) where the cylinder head and intake manifold meet.
4. Install the valve rocker arm cover.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

5. Install the valve rocker arm cover bolts.

Tighten
Tighten the valve rocker arm cover bolts to 10 N·m (89 lb in).

6. Install the vacuum lines from the upper intake manifold.
7. Install the ignition coil studs.

Tighten
Tighten the ignition coil studs to 25 N·m (18 lb ft).

8. Install the electronic ignition control module.
9. Install the electronic ignition control module nuts and bolts.

Tighten
Tighten the electronic ignition control module nuts and bolts to 25 N·m (18 lb ft).