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Author of "101 Projects"
Join Date: Jan 1995
Location: Rolling Hills Estates, CA
Posts: 27,056
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It's an aluminum turbo block (from previous thread).
Sounds like they got cross-threaded, which is common with aluminum. Try going in and out with the stud until you get it out - there's not too much other way. Also spray some lubricant down in there (WD-40 is okay).
-Wayne
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