GM 91177110 Engine Exhaust Manifold (W/Warm Up 3Way Catalytic Converter)

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Disconnect the negative cable from the battery. Set the parking brake and block the rear wheels. Raise the front of the vehicle and support it securely on jackstands. Working from under the vehicle, remove the nuts that secure the exhaust system to the bottom of the exhaust manifold. Apply penetrating oil to the threads to make removal easier. On fuel injected models, remove the air cleaner assembly. Unplug the oxygen sensor wire. Remove the fasteners that secure the heat shields to the exhaust manifold and to each other. Apply penetrating oil and remove the nuts/bolts, then remove the heat shields from the manifold. Apply penetrating oil to the threads, then remove the exhaust manifold mounting nuts/bolts. Slip the manifold off the studs and remove it from the engine compartment. Clean and inspect all threaded fasteners and repair as necessary. Remove all traces of gasket material from the mating surfaces and inspect them for wear and cracks. Install a new gasket, install the manifold and tighten the nuts in several stages, working from the center out, to the torque. Reinstall the remaining parts in the reverse order of removal. Run the engine and check for exhaust leaks.

Install a new gasket, install the manifold and tighten the nuts in several stages, working from the center out, to the torque.