GM 24505662 Manifold Assembly, Lower Intake

After cleaning the mating surfaces, it is recommended to chase the threads in the bolt holes with a tap and remove debris with compressed air.

Relieve the fuel pressure and disconnect the negative battery cable from the battery.

For installation, the mating surfaces should be cleaned, old sealant or gasket material should be removed using a gasket scraper and lacquer thinner or acetone, and any debris from the intake ports or lifter valley should be removed using a vacuum cleaner. The threads in the bolt holes should be chased if necessary, and a bead of ATV sealant or equivalent should be applied to the front and rear ridges of the engine block. The intake manifold gasket, pushrods, and rocker arms should be installed. The manifold should be carefully lowered into place and the mounting bolts/nuts should be installed finger tight. The mounting bolts/nuts should be tightened in three steps, working from the center out in a crisscross pattern.

Begin by disconnecting the negative battery cable, draining the coolant from the radiator, and removing the air cleaner assembly.

Clean the surfaces with a rag soaked in lacquer thinner or acetone.

Disconnect the accelerator linkage at the carburetor, the linkage bracket at the manifold, and the cruise control chain if applicable.

Carefully lower the manifold into place, apply thread lock compound to the mounting bolt threads, and install the bolts finger tight.

Install the remaining components in reverse order of removal, change the oil and filter, refill the cooling system, start the engine, and check for leaks.

Next, remove the TBI cover and air cleaner assembly, then raise the front of the vehicle and support it securely on jackstands while draining the coolant.