Exhaust System Alignment

WARNING: Refer to Exhaust Service Warning .

CAUTION: Refer to Exhaust System Inspection Caution .

NOTE: This procedure is only to be performed if the exhaust is incorrectly aligned or is not clear of all other components or chassis.

NOTE: Make sure all exhaust retaining nuts and bolts are loose before conducting this procedure.

NOTE: The L98 exhaust is pictured but flange bolts are in the same location on LY7.

Fig 1: Identifying Catalytic Converter To Exhaust Manifold Retaining Nuts

Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to Fastener Caution .

Initially tighten catalytic converter to exhaust manifold retaining nuts (1) to 20 N.m (15 lb ft).
Tighten catalytic converter to exhaust manifold retaining nuts (1) to 45 N.m (33 lb ft).
Tighten exhaust crossover pipe to catalytic converter retaining nuts (2) to 40 N.m (30 lb ft).
Tighten muffler to exhaust crossover pipe retaining bolts (3) to 45 N.m (33 lb ft).