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289 Intake Torque Specs

Correct torque value for the bolts on a vehicle is important for auto safety. A torque value that should be paid particular attention to is that of the intake manifold bolts. The intake manifold bolts must have the correct torque value, as well as be torqued in the proper sequence.

Reasoning

The intake manifold is of manufactured of cast iron, and it is bolted to a cast iron block, so proper torque ensures the casting is not damaged. The proper torque also ensures the intake manifold gasket properly seals, preventing debris from entering the combustion chamber. It also prevents vacuum leaks from forming and causing running issues.

How

Proper torque is achieved with a torque wrench. A torque wrench is very similar to a basic ratchet, but it is able to be set to a certain torque value. When the set torque value is achieved, it emits an audible signal, typically a clicking sound, to alert the user.

Amount

Torque is measured in a value known as foot-pounds, sometimes abbreviated "ft-lb." All 12 of the bolts on the intake manifold of a 289 engine require a final torque value of 25 ft-lb.

Process

You cannot simply tighten the bolts in straight sequence, as the last bolts tightened do not seal as well as the first. There is an alternating pattern to assure the best seal. Starting with the front passengers side bolt and moving clockwise, the torque sequence goes 9-5-1-3-7-11-12-8-4-2-6-10 (see reference for image). The sequence must be performed three times to ensure accuracy.