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Registered
Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 11,365
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The bolt will probably still be fine if the head isn't rounded. If not, grade 8 would be fine for standard or 10.9 should be fine for metric. I'd try to keep the non-threaded length the same.
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2014 Cayman S (track rat w/GT4 suspension)
1979 930 (475 rwhp at 0.95 bar)
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