I have an 85 K5 that I'm trying to replace afew broken exhaust manifold studs in, the ones that bolt to the exhaust pipe. Anyway, from what it looks like, the studs are part of the manifold, is that right??? I got replacement studs from NAPA but after looking at the top of the manifold, the studs appear to be welded in. Is there anyway to get the broken ones out? I would assume drilling them out but if they are in fact part of the manifold, I'm stuck as to what to do. Any info would help!