'65 exhaust manifold stud

[Twan B.]

Can anyone tell me how much tork the lock nuts for the exhaust manifolds must have, it's hard to know how much tork to give the nuts because of the lock system in the nuts.
Gr, twan

[Joe C.]

Re: '65 exhaust manifold stud

The 1965 Shop Manual shows all exhaust manifold bolts (3/8" - 16) @ 18-22 ft-lbs.
The 1963 Shop Manual shows the same.

The manifold-to-engine pipe nuts are shown in the 1965 AIM on page A2, UPC 8. Apparently the procedure was as follows:
First - FAIRLY EVENLY torqued to 13-15 ft-lbs during assembly, using low speed on impact driver.
Next - checked @ 8 ft-lbs, min., after roll test. **


Be sure that all threads are clean, and bolt holes are chased. Use motor oil or anti-seize compound on threads, under bolt heads, and under washers.
When tightening the stud nuts, the most important thing to remember, is to try to keep the tightening process uniform, so as to minimize "cocking" of any sealing surfaces (although total elimination of this will be impossible). I generally don't use a torque wrench on the engine pipe nuts, but rather "feel" them for uniform torque.

**: my note--I recommend that you use anti-seize compound on all manifold nuts and bolts. This remains whether or not you are using stainless fasteners. If you use anti-seize rather than motor oil, reduce torque values by about 15 per-cent.

[Gene M.]

Re: '65 exhaust manifold stud

...... is to try to keep the tightening process uniform, so as to minimize "cocking" of any sealing surfaces (although total elimination of this will be impossible). I generally don't use a torque wrench on the engine pipe nuts, but rather "feel" them for uniform torque.

**: my note--I recommend that you use anti-seize compound on all manifold nuts and bolts. This remains whether or not you are using stainless fasteners. If you use anti-seize rather than motor oil, reduce torque values by about 15 per-cent.

What I do is run the nuts on a 3/8 tap to make the threads non cutting. This allows easy removal at a later date. Just tighten them good as Joe suggests. Suggestion of stainless studs is worth the deduct.

[Twan B.]

Re: '65 exhaust manifold stud

thanks for the answers, i've just ran the tap through the nuts, problem solved.......

I can't find the torks in my AIM, thanks Joe...

Gr, Twan

[John H.]

Re: '65 exhaust manifold stud

I can't find the torks in my AIM, thanks Joe...

Gr, Twan

Twan -

The torque for the manifold stud nuts is in UPC 8, sheet A2, item #5; 13-17 ft-lbs (minimum 8 ft-lbs. after roll-test).