Manifold nuts?
 

Les Andrews book says 45ft pound torque on the Manifold nuts, is that accurate?

Re: Manifold nuts?
 

Re: Manifold nuts?
 

Yep. Should be 35-40#. Just nice and snug. Mind the cupped washers, convex out.

Re: Manifold nuts?
 

I've read and heard a lot of different numbers for manifold torque specs!?!:confused: I even did it to 65 lbs once.:eek: It literally pushed the gasket out.:o
Now I do it to 40-45 lbs.;)

Bob-A:D

Re: Manifold nuts?
 

I guess it should be 45lbs even with Reds headers and an Ansen intake manifold.

Re: Manifold nuts?
 

Bratton's calls for 25-30.
Tighten however you wish.
Keep in mind that the manifolds heat up quite hot and need to be able to move around (expand/contract) under those cupped washers. Get them too tight and this can't happen, something will crack instead, like the ears on the castings or the main casting itself. Physics will prevail.

If you are having trouble with the manifolds leaking, more tightening is not the answer....but removing them and having the gasket surface trued at a machine shop is

Re: Manifold nuts?
 

Experience has shown that manifold nuts , like head nuts, should be torqued at least twice, maybe three or four times. Actually, good firm pull on a 1/2" ratchet wrench should pull it down tight. Remember, there were no torque wrenches in 1930.
Terry

Re: Manifold nuts?
 

https://en.wikipedia.org/wiki/Torque_wrench

"It was invented by Conrad Bahr in 1918"

Perhaps Ford was not using them 10 years later?I really don't know.

Re: Manifold nuts?
 

As Ford never used torque wrenches on the A, so there are no Ford torque specs to be followed and no one publication is correct.

Re: Manifold nuts?
 

other published specs for similar parts of other car makes can be used as guidelines;
many posters work on all vintage vehicles

Re: Manifold nuts?
 

So it seems! However,they were limited to Chrysler. Later a guy named Sturtevant refined it and marketed it. Thanks for the article!
Terry