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Author of "101 Projects"
Join Date: Jan 1995
Location: Rolling Hills Estates, CA
Posts: 27,056
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You're probably okay without splitting the case - just replace the rod bolts with ARP or RaceWare ones. If the studs are threaded all the way down, they are the later-style 993 ones, and should also be okay (these ones don't seem to break).
-Wayne
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