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The 6 that hold the flexplate or flywheel to the crank? Mine are stripped and I'm pretty screwed now because of it.
I don't reckon you can get a pipe wrench to get a bite on them can ya? Sometimes tightening a stuck bolt a little helps loosen it up, but yours might be too far gone now. Heat helps too, so when you weld the nut on it, use plenty of heat and a heavy weld. Only thing is you might have to wait for it to cool, you're not supposed to heat the bolt because it will expand and get more difficult to remove, but once it cools it may pop loose whatever is hanging it up. And since it's a crankshaft you don't really have the option of putting heat on the crank. Good luck bubba!