For 1990-2009 cars

### Removal Procedure

1. Remove the engine assembly. Refer to Engine Replacement .
2. Remove the exhaust manifold lower heat shield bolts.
3. Remove the exhaust manifold lower heat shield.
4. Remove the exhaust manifold upper heat shield bolts.
5. Remove the exhaust manifold upper heat shield.
6. Remove the AIR pipe bolts (1).
7. Remove the AIR pipe (2) from the exhaust manifold.
8. Remove the coolant pipe (3) and the engine lift bracket bolt (2) from the cylinder head.
9. Remove the oil level indicator tube (4).
10. Remove the exhaust manifold nuts.
11. Remove the exhaust manifold.
12. Remove the exhaust manifold gasket.
13. Clean the exhaust manifold mating surfaces.

### Installation Procedure

1. Install the exhaust manifold gasket.
2. Install the exhaust manifold.

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.

3. Install the exhaust manifold nuts.

Tighten
Tighten the exhaust manifold nuts to 20 N·m (15 lb ft).

4. Install the oil level indicator tube (4).
5. Install the coolant pipe (3) and the engine lift bracket bolt (2) to the cylinder head. Ensure the bolt (2) passes through all of the attached components.

Tighten
Tighten the coolant pipe/engine lift bracket bolt (2) to 20 N·m (15 lb ft).

6. Install the AIR injection pipe to the exhaust manifold.
7. Coat the AIR injection pipe bolts with high temperature anti-seize compound, GM P/N 12371386 or equivalent.
8. Install the AIR injection pipe bolts (1).

Tighten
Tighten the AIR injection pipe bolts to 20 N·m (15 lb ft).

9. Install the exhaust manifold upper heat shield.
10. Coat the exhaust manifold upper heat shield bolts with high temperature anti-seize compound, GM P/N 12371386 or equivalent.
11. Install the exhaust manifold upper heat shield bolts.

Tighten
Tighten the exhaust manifold upper heat shield bolts to 8 N·m (71 lb in).

12. Install the exhaust manifold lower heat shield.
13. Coat the exhaust manifold lower heat shield bolts with high temperature anti-seize compound, GM P/N 12371386 or equivalent.
14. Install the exhaust manifold lower heat shield bolts.

Tighten
Tighten the heat shield bolts to 8 N·m (71 lb in).

15. Install the engine assembly. Refer to Engine Replacement .