The exposed threads are fine. I assume the part that's in the head is OK too - they've been in there for 15 years and never removed as far as I know. I believe they're just seized up from being in there for so long.
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1998 Mustang GT Coupe - World's Slowest Racecar
2005 Toyota 4Runner SR5 V8
2013 Volkswagen Jetta Sportwagen TDI
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