You might do a search on head studs to read some of the past discussions. I found this one were according to Warren, Bruce Anderson now recommends the use of steel for all 24 head studs instead of dilavar:
http://www.pelicanparts.com/ultimate/Forum3/HTML/001010.html
I assume you won't have to worry about time-serting the case. Anybody know for sure?
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Greg
72 911S