1962 vacumn carburetor mounting stud

[Kenneth F.]

After installing the hollow carburetor mounting stud in the L.R. position on a 300h.p. manifold, there is only a thread or two exposed for the nut to engage. I have a 3/8" heat insulator, metal heat shield, and gasket under the A.F.B. A stud that could be original, is 2 1/8" overall, 1/2" coarse thread that goes into the manifold, no shoulder, 3/4" fine threads for the nut , and 11/16" smooth stud for the vacumn hose. A repro stud is the same overall length, 7/16" inch coarse thread, 1/4" no threads, 5/8" fine threads, and 3/4" smooth for the vacumn hose. The result is the same for both studs, though. I only have a thread or two exposed for the nut to engage. There do not seem to be enough threads to install the stud partially into the manifold, to end up with more threads on top of the carburetor flange.
I checked the articles in the archives, but am still not clear.

Any suggestions would be appreciated.

Ken

[Stuart F.]

Re: 1962 vacumn carburetor mounting stud

Ken;

Sometimes I have had to back the studs out to give me enough thread to properly engage the nut when I use a gasket/spacer arrangement other than stock. But these are not drilled studs, and also my manifold is aluminum so doing so does not present me with a stud too loose to remain in position when the nut is tightened. Do you use a gasket under your spacer, and is your spacer and plate correct thickness?

Stu Fox

[Kenneth F.]

Re: 1962 vacumn carburetor mounting stud

Stu, My insulator spacer is 3/8." I will use a gasket, and a thin stainless plate that I bought all from CC.

Ken

[Stephen R.]

Re: 1962 vacumn carburetor mounting stud

I ran into the same problem on my 59. I believe one of the vendors Paragon, Zip or Keen sell a stud the is longer, about 3 inches.

[Kenneth F.]

Re: 1962 vacumn carburetor mounting stud

Paragon has a stud that is 5/16" longer. I appreciate the heads up.

Thank you.