K 1500 Suburban 4WD V8-5.3L VIN Z Flex Fuel (2003)
1. If the catalytic converter was replaced, perform the following:
1.1.
Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen sensors.
1.2.
Install the oxygen sensors.
Tighten the oxygen sensors to 42 Nm (31 ft. lbs.).
2. Install the catalytic convertor.
3. Install NEW exhaust manifold pipe seals to the exhaust manifolds.
4. Install the right exhaust manifold pipe nuts until sung.
5. Install the left exhaust manifold pipe nuts until snug.
6. Tighten the right and left exhaust manifold pipe nuts.
