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Judging from the resistance I'm getting, I'm betting I'll strip this little f*cker. Any advice to avoid said disaster or what to do after I strip it (besides curse like a drunken sailor)? Head is coming off for a head gasket replacement.
Tap it with a hammer. Spray BP Blaster/Liquid Wrench/etc on it. Could also carefully heat it up with a torch as it sounds like its been Loctited in there.