GM 10087650 Plenum,Intake Manifold

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Loose the cable from the negative battery terminal, while doing so unscrew all the hoses from the air cleaner assembly, mark them by number and label them in an organized manner so as to know where to reconnect each one of them. Refer to the existing wear elements for their description, location and function that is as follows: Label, and then removed the fuel line and vacuum line connected to the throttle body, plus the electrical connector; do have a container ready for fuel which will come dripping once you unhook the fuel line and cap it. Remove the throttle linkage and make sure you take note where it was, and remove the cruise control linkage if installed. Pull the coil wire out, then unscrew the two brass retaining screws and one steel bolt and then extracted the coil. Disconnected the coolant hoses from the manifold, then use the manifold retaining bolts to loose the manifold from the cylinder head without levering or tapping between them in order not to damage the gasket sealing surfaces. Take off the manifold gasket, and if necessary, reinstall all components which are already connected to the old manifold to the new one. Before installing the cylinder head or manifold gasket, it is recommended that the sealing surfaces of both the cylinder head and manifold gasket be cleaned completely of all gasket material and sealing compound. Run an RTV-type silicone sealant around the intake manifold and the cylinder head flanges so that it will not ooze into air or water passages when tightening the bolts. Put a fresh intake manifold gasket on the manifold, align the manifold to the cylinder head, and put the mounting bolts just enough to been turned by hand. It is recommended that the mounting bolts should be tightened gradually in this sequence to the specified torque range. Reinstall the remaining components in the reverse order of removal, pour more coolant in the radiator, switch on the engine and look for evidence of the leak, rectify the ignition timing and the idle speed as required.

Reinstall the remaining components in reverse order, fill the radiator with coolant, start the engine, and check for leaks, adjusting the carburetor idle speeds if necessary.

Remove the distributor, ensuring the distributor cap with spark plug wires is taped or wired out of the way.

If replacing the intake manifold, transfer applicable accessories such as the carburetor, temperature or oil pressure sending unit, water outlet and thermostat with a new gasket, heater hose and water pump hose adapter fittings, EGR valve with a new gasket, emission system TVS switches, carburetor choke assembly, and ignition coil and bracket for 1970 to 1974 models.

Ensure all interfering electrical wires, vacuum hoses, and coolant hoses are disconnected before separating the manifold from the engine without prying between mating surfaces.

Drain the radiator and remove the air cleaner.

Reinstall remaining components in reverse order, fill the radiator with coolant, start the engine, and check for leaks while adjusting ignition timing and idle speed as necessary.