Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Protective Goggles and Glove Caution in the Preface section.

1. Remove the secondary air injection (AIR) check valve. Refer to Secondary Air Injection Check Valve Replacement .
2. Remove the exhaust seal. Refer to Exhaust Seal Replacement .
3. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement .
4. Remove the exhaust manifold bolts.
5. Remove the exhaust manifold.



6. Remove and discard the exhaust manifold gasket.
7. Clean and inspect the exhaust manifold. Refer to Exhaust Manifold Cleaning and Inspection .

1. Clean and apply threadlock GM P/N 12345493 (Canadian P/N 10953488) to the exhaust manifold bolt threads.
2. Position a NEW exhaust manifold gasket onto the cylinder head.



3. Position the exhaust manifold against cylinder head.
4. Install the exhaust manifold bolts.

Notice: Refer to Fastener Notice in the Preface section.




5. Tighten the exhaust manifold bolts.

Tighten

1. Tighten the bolts a first pass in sequence to 20 N·m (15 lb ft).
2. Tighten the bolts a second pass in sequence to 20 N·m (15 lb ft).
3. Tighten the bolts a final pass in sequence to 20 N·m (15 lb ft).
6. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement .
7. Install the exhaust seal. Refer to Exhaust Seal Replacement .
8. Install the AIR check valve. Refer to Secondary Air Injection Check Valve Replacement .