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Author of "101 Projects"
Join Date: Jan 1995
Location: Rolling Hills Estates, CA
Posts: 27,056
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#2 - the engine has definitely been apart before if it has the fully-threaded dilavar studs installed.
#3 - yes you can replace these if you have the case halves separated. The 993 ones are somewhat more durable than the older ones - you might want to keep them.
As for separating the case halves, simply go at it with a rubber mallet, and don't be shy...
-Wayne
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