Installation Procedure

Install a new exhaust manifold gasket.
Install the exhaust manifold to the cylinder head. See Figure.

Fig 1: Identifying Exhaust Manifold Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

Important: Install the new exhaust nuts.
Install the new exhaust manifold to cylinder head retaining nuts. Follow the tightening sequence.
Tighten

Tighten the nuts to 13 N.m (115 lb in).
Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
Install a new exhaust manifold to flex coupler gasket (2).

Fig 2: Connecting Exhaust Pipe To Exhaust Manifold
Courtesy of GENERAL MOTORS CORP.
Push the flex coupler into position on the exhaust manifold.
Important: Install the new exhaust nuts.
Install the retaining nuts (3) which secure the manifold to the flex decoupler (4).
Tighten

Tighten the nut to 30 N.m (22 lb ft).
Lower the vehicle.
Install the oxygen sensor. Refer to OXYGEN SENSORS .

Fig 3: Installing Oxygen Sensor
Courtesy of GENERAL MOTORS CORP.
Install the exhaust manifold heat shield.

Fig 4: Installing Exhaust Manifold Heat Shield
Courtesy of GENERAL MOTORS CORP.

Tighten

Tighten the bolts to 25 N.m (18 ft lbs).
Connect the negative battery cable.