For 1990-2009 cars

### Removal Procedure

#### Tools Required

J 36660-A Torque Angle Meter

1. Remove the left valve rocker arm covers. Refer to Valve Rocker Arm Cover Replacement .
2. Remove the lower intake manifold. Refer to Intake Manifold Replacement (VIN 1).
3. Remove the valve rocker arms and pedestals. Refer to Valve Rocker Arm and Push Rod Replacement .
4. Remove the pushrods.
5. Remove the guide retainer bolts and retainer.
6. Remove the lifter guides.
7. Remove the valve lifters.
8. Clean the following areas:

• | All gasket surfaces with degreaser

• | Valve train parts.

9. Inspect the following areas:

• | Valve train parts

• | Lifters for wear

• | Cam lobes for wear

### Installation Procedure

#### Tools Required

J 36660-A Torque Angle Meter

1. Dip the valve lifters in prelube GM P/N 12345501 or equivalent before installation.
2. Install the valve lifters.
3. Install the lifter guides.

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.

4. Install the guide retainer.

Tighten
Tighten the guide retainer bolts to 30 N·m (22 lb ft)

5. Install the pushrods.

Notice: This bolt is designed to permanently stretch when tightened, and therefore MUST be replaced anytime it is removed. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.

6. Install the valve rocker arms and pedestals. Refer to Valve Rocker Arm and Push Rod Replacement .
7. Install the lower intake manifold. Refer to Intake Manifold Replacement (VIN 1).
8. Install the valve rocker arm covers. Refer to Valve Rocker Arm and Push Rod Replacement .