With RPO NCI or NF7

Exhaust Manifold Installation - Left (W/RPO NC1 or NF7)

Notice: Refer to Fastener Notice in Service Precautions.





1. If the engine is equipped with coolant heaters, install the left side (1) heater as follows:
1.1. Place the coolant heater (1) in position on the cylinder block.
1.2. Install the coolant heater bolt.
^ Tighten the coolant heater bolt to 10 Nm (89 inch lbs.).





Important: DO NOT reuse the exhaust manifold gasket.

2. With the manifold still on the bench, position a new manifold gasket (1) in place on the manifold sealing surface.
3. Install two outer manifold bolts (6) in the manifold to retain the gasket.
4. Install a new manifold to intermediate pipe flange gasket (5).
5. Using two hands, place the manifold (2) in the intermediate pipe and onto the cylinder head.
6. Install new manifold flange bolts (3) for maximum joint integrity. Hand tighten. Do not torque the flange bolts to specification until the engine is mounted in the vehicle.
7. Hand tighten the two outer manifold bolts.
8. Install the remaining manifold bolts.
^ Tighten the exhaust manifold bolts (6) to 25 Nm (18 ft. lbs.).





9. Coat the oxygen sensor threads with high temperature anti-seize, GM P/N 5613695 or equivalent.
10. Install the oxygen sensor (1).
^ Tighten the oxygen sensor to 40 Nm (30 ft. lbs.).





Important: DO NOT reuse the old A.I.R. valve pipe gasket.

11. Install the NEW A.I.R. valve pipe gasket.
12. Install the A.I.R. valve.
13. Install the A.I.R. valve nuts to the mounting bracket.
^ Tighten the A.I.R. valve nuts to 9 Nm (80 inch lbs.).
14. Install the A.I.R. valve bolt through the mounting bracket.
^ Tighten the A.I.R. valve bolt to 9 Nm (80 inch lbs.).
15. Install the A.I.R. valve pipe nuts to the exhaust manifold.
^ Tighten the A.I.R. valve pipe nuts to 9 Nm (80 inch lbs.).





16. Install the A.I.R. vacuum harness.
17. Connect the vacuum harness to the water crossover vacuum port.





18. Connect the vacuum harness to the A.I.R. valve.