For 1990-2009 cars only
- Install the exhaust manifold gasket.
- Install the exhaust manifold.
- Add threadlock GM P/N 12345493 (Canadian P/N 10953488) to the exhaust manifold bolt threads.
- Install the exhaust manifold bolts.
- Tighten the exhaust manifold bolts.
- Install the exhaust manifold heat shield studs, if required. Tighten the exhaust manifold heat shield studs to 10 N·m (89 lb in).
- Install the exhaust manifold heat shield.
- Add anti-seize GM P/N 12371386 (Canadian P/N 993128) to the exhaust manifold heat shield nuts.
- Install the exhaust manifold heat shield nuts. Tighten the exhaust manifold heat shield nuts to 10 N·m (89 lb in).
Caution: Refer to Fastener Caution in the Preface section.
| 5.1. | Tighten the exhaust manifold bolts a first pass in sequence to 20 N·m (15 lb ft). |
| 5.2. | Tighten the exhaust manifold bolts a second pass in sequence to 20 N·m (15 lb ft). |
| 5.3. | Tighten the exhaust manifold bolts a final pass in sequence to 20 N·m (15 lb ft). |
