Firstfives.org

The head is aluminum. From previous experience it's not a good idea to be threading the studs in/out of that. Instead, the studs are installed to the proper depth with Lock-tite (heat compatible ?) and the future assembly is done using the nuts.

Yes, no.

Very old rusted two piece exhaust manifold features three studs with rust welded nuts, one twisted off cat stud, three studs between the two pieces w/rusted nuts,...

And the 1979 manifold has a larger exit diameter, some kind of probe tube, and the realoem.com drawing is worthless for gasket diameters, books for stud install procedures.

Hmmm, outside of repeated screwing into aluminum castings, which is less than ideal, but tolerable, was there a question or just a rant?

I will add a little. Anti seize is not perfect, but a good idea. And those nuts which you have rust welded in place, even in ok, but less than new shape, replace them. The copper acts as a one time use antiseize, and after the first time is gone. The 12s on the exhaust manifold studs coming out of the head. The 14/17MM ones on the exhaust manifold, the 12MM ones holding the two halve together. The 12s holding the front and back halves of the cat/muffler assy.

Thank you, for putting up with my obtuse writing habits.

Instead of leaving things rust welded, installing parts just because they will go back together as welded, I prefer to do things the Mike W. (Penske) correct way.

Not the stupid previous owner way.