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1991 964 C2 Broke valve cover exhaust stud

Engine

Vehicle Information: Year: 1991; Body Type: Coupe; Engine (type, size, modifications): 3.6 l no mod's; Total Mileage: 55000;

I over torqued the 8 mm exhaust valve cover stud. I have tried double nut-ing and using a vise grip, both to no avail. Some web forums suggest heating this stud or thesurrounding area or both (seems to be no consensus here). I've also saw onethat spoke of a stud extractor. Some suggest just let it go and see if it leaks

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