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Alternator bolt frozen in place

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I am working on a stock 1973 Vega. I am having a problem I have never experienced before. The top bolt holding the alternator on is frozen in place and can not be removed. The best I can tell the bolt is frozen where it contacts the alternator and not the bracket. When I try to loosen the bolt the bolt and the alternator turns together. The bolt is 3/8 by about 5 inches long, and its hard to get to.

I have removed the nut on the back of the bolt, sprayed penetrating oil all over it, put a brass punch on the alternator where the bolt goes thru and struck it 10 times hoping to loosen it up, put a 4 foot long pry bar on the back of the bolt and tried to push it forward, the pry bar is bending and the bolt is not moving.

Anyone have an idea how to get this bolt out?

The bearings in the alternator are making a terrible noise. Is it worth it to replace just the bearings, or should I replace the whole alternator? Thanks

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