C 3500 Truck 2WD V8-6.0L VIN U (2001)
2. Apply a 5 mm (0.2 inch) wide band of threadlock GM P/N 12345493 or equivalent to the threads of the exhaust manifold bolts.
3. Install the exhaust manifold, NEW gasket and bolts.
3.1.
Tighten the exhaust manifold bolts a first pass to 15 Nm (11 ft. lbs.). Tighten the exhaust manifold bolts beginning with the center two
bolts. Alternate from side-to-side, and work toward the outside bolts.
3.2.
Tighten the exhaust manifold bolts a final pass to 25 Nm (18 ft. lbs.). Tighten the exhaust manifold bolts beginning with the center two
bolts. Alternate from side-to-side, and work toward the outside bolts.
4. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the rear of the left cylinder head.
5. Install a NEW AIR check valve pipe gasket, the nuts, and pipe (with check valve) to the left exhaust manifold.
^
Tighten the AIR check valve pipe nuts to 25 Nm (18 ft. lbs.).
6. Install the AIR check valve pipe (crossover) (1) to the check valves.
7. Position the AIR check valve pipe (crossover) hose spring clamps.
