[AngryPunk]

Passenger side manifold to exhaust connection (before the cat). This damn bolt won't budge. The other 5 were ok. Seemed to be 14mm but that isn't working. The bolt itself is 7 mm but I'm nervous about breaking my 7mm socket leaning too hard on that. Gave it plenty of Mooveit. I don't have a blow torch but I have a wee butane torch. I'll try hitting it with that . Any other suggestions?

 

[M_a_t_t]

Can you put a nut splitter on it or a Dremel with a cutoff wheel? Then just run a die on it to clean the threads and get a new nut.

 

[MI_Ghost]

Run by a muffler shop and have them persuade it.

 

[chevymaher]

Whiz wheel cut it off at the nut. Once it is apart get the stud out.

 

[Godron629]

If there's a bolt on the other side, put it back in and tighten it up before trying to loosen the tough one.

Could you use a box-end wrench with a pipe on the end?

 

[AngryPunk]

I can't seem to get hold of it well enough. I guess I could take the manifold off and take the whole thing to a shop.
It doesn't seem to be about leverage as much as grip.
I'm worried that if I cut it off at the nut, I'll have to drill out the top part because it's threaded too.

 

[tinworm]

I can't seem to get hold of it well enough. I guess I could take the manifold off and take the whole thing to a shop.
It doesn't seem to be about leverage as much as grip.
I'm worried that if I cut it off at the nut, I'll have to drill out the top part because it's threaded too.

To expand on what was already mentioned, once you are able to break the exhaust sections apart after cutting the nut side, you will have the length of stud that passed through the flange to work with to get the rest out, should be able to get it off with some vice grips, and to be sure a long heating with your torch

 

[M_a_t_t]

Just to make sure we are on the same page, if you cut just the nut off, don't touch the threads of the stud then you shouldn't have to replace the stud. You don't have to cut the whole stud off at the flange.

https://www.autozone.com/test-scan-and-specialty-tools/nut-splitting-tool/p/oemtools-7-8in-nut-splitting-tool/70112_0_0

 

[tinworm]

I doubt he can cut off that rusty nut without damaging the stud at least some. Those studs are cheap, a lot cheaper than a specialty tool, though i want that.

 

[Birdshake]

I remember the exhaust flange hardware being sae not metric so maybe a 9/16 6pt deep socket being a little bit tighter might give you enough grip. And heat.

 

[Big_kid]

This is why I replaced both exhaust manifolds when I did my engine swap. I had no desire to play this game.

 

[Leeann_93]

I wonder if the non-threaded part of the stud is what's stuck.

Those three all came out with a 15mm deep socket, just like that. We had one stuck in the '02 that wouldn't come out for love, money, or oxy-acetylene persuasion.