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Has anyone ever used JB Weld on an exhaust manifold?
I am doing some exhaust work and for some reason the studs came out of
the manifold rather than the brass nuts coming off. (I thought that
was strange). Anyhow, I decided to replace the studs and nuts while I
was at it. There are 3 of them. Two worked fine, the 3rd will not
hold in the manifold. Apparently the threads are bad. Changing the
manifold is not an option. However, what if I JB Weld it in? I know
JB Weld is good, but is this too hot for it to work? Has anyone ever
done it?

Drill it out and install a helicoil.