Installation Procedure

IMPORTANT: To assist in installing the exhaust manifold to the engine, the tabs at the bolt holes on a NEW exhaust manifold gasket will hold the bolts and the gaskets in place.

Sub-assemble the bolts, spark plug wire shields, and NEW gaskets to the exhaust manifold.
Ensure that the exhaust manifold bolts are held in place by the tabs on the exhaust manifold gaskets.

Fig 1: Tabs On Exhaust Manifold Gaskets

Courtesy of GENERAL MOTORS CORP.

Install the exhaust manifold.
Install the spark plug wire shields.
If reusing the fasteners, apply threadlock GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the threads of the exhaust manifold bolts.
NOTE: 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.
Install the exhaust manifold bolts.

Fig 2: Exhaust Manifold Bolts
Courtesy of GENERAL MOTORS CORP.

Tighten
1. 6.1. Tighten the exhaust manifold bolts on the first pass to 15 N.m (11 lb ft).
2. 6.2. Tighten the exhaust manifold bolts on the final pass to 30 N.m (22 lb ft).
Install the spark plug wires to the spark plug wire retainers.
Install the spark plug wires onto the spark plugs.
Raise the vehicle. Refer to LIFTING & JACKING THE VEHICLE in General Information.
Connect the exhaust pipe to the exhaust manifold. Refer to Exhaust Manifold Pipe Replacement .
Lower the vehicle.
Install the bolt for the oil level indicator tube.
Tighten

Tighten the oil level indicator tube bolt to 12 N.m (106 lb in).