Installation Procedure

Fig 1: View Of Left Exhaust Manifold Heat Shield & Bolts

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the heat shield (2), and bolts (3) to the exhaust manifold (1), if necessary.
Tighten: Tighten the bolts to 9 N.m (80 lb in).

Fig 2: Exhaust Manifold Bolts, Manifold & Gasket (Left)

Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

Tighten the exhaust manifold bolts as specified in the service procedure. Improperly installed and/or leaking exhaust manifold gaskets may affect vehicle emissions and/or On-Board Diagnostics (OBD) II system performance.
The cylinder head exhaust manifold bolt hole threads must be clean and free of debris or threadlocking material.
Do not apply sealant to the first three threads of the bolt.

Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 101953488) or equivalent to the threads of the exhaust manifold bolts.
Install the exhaust manifold, NEW gasket and bolts.
Tighten:
1. Tighten the exhaust manifold bolts a first pass to 15 N.m (11 lb ft). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
2. Tighten the exhaust manifold bolts a final pass to 25 N.m (18 lb ft). Tighten the exhaust manifold bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside bolts.
Install the spark plug wires. Refer to Spark Plug Wire Replacement in Engine Controls - 4.8L, 5.3L and 6.0L.
Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.
Raise the vehicle.

Fig 3: Exhaust Manifold Pipe Nuts (Left)

Courtesy of GENERAL MOTORS CORP.

Install the exhaust manifold pipe nuts.
Tighten: Tighten the nuts to 50 N.m (37 lb ft).
Lower the vehicle.
Install the ignition coils. Refer to Ignition Coil(s) Replacement in Engine Controls - 4.8L, 5.3L and 6.0L.