My oxy acetylene torch and my mig welder just saved my ass.
This is part of where the overhead and shop supplies fees come in.

So- my Isuzu needs a clutch.
So- I tried to sell it because the transmission is way too heavy and difficult to remove safely-period.
Nobody was biting.
Sew- Buttons!

I decided to pull the engine to replace the clutch. More on that as it evolves.

Here's where the heat comes in-

TEH MANIFOLD!!!

-2 exhaust manifold fasteners soaked in penetrant twice a day for three days-

They wanted to break. still. I complied. The torch would not fit in where I needed it to so I figured I could deal with it better with the engine out. I was right-sort of.

I know a trick. I tried it with the manifold attached to the engine but it wasn't working. Luckily the bolts holding the manifold to the head came out w/o issue.

I tried to price a new exhaust manifold but it's $300 from Isuzu IF they can get it and not available aftermarket.

I tried the trick again w/ the manifold removed. Apparently it works better when you can see what you're doing. Overhead welding is a bitch.

The trick- OK, you've got some broken rusted exhaust bolts. One is broken off recessed into teh manifold and the other is sticking out a bit.
Simple:
Weld a nut to the broken fastener, heat teh manifold and remove. Just like that ;)
yeh
experience, talent, finesse and quite a bit of luck (mostly luck and experience).
Here's a few pics after jump-