Any car mechanics in the house?

[DeeBye]

Hi,
Very true -- I've found Liquid Wrench and heat (LP torch is good) to help a lot. That was pre WD-40, which might work better. Also, if you're looking at a nut and bolt (as opposed to a nut and stud) it's often easier and faster just to shear or chisel the old ones off and replace them. Studs are a problem, but shouldn't be much of an issue in this case, since they're mostly up where the manifold connects to the block.

There are no studs, just some rusty bolts. I picked up some muffler tape and I'm going to give that a go. If it doesn't hold I'll bring it over to a muffler shop and see if they can weld it. If they can't, I'll see if some local salvage yards have a used flex pipe in decent shape.

Thanks for the replies here. The car is old, but it's in decent shape otherwise and has a certain amount of sentimental value seeing as it was my late grandfather's. I think he'd appreciate me doing what I could to keep it going, but he'd also hate me dumping excessive amounts of money into it.