Stud length with the ARP, Raceware or Supertec does not matter since they all use 12 point nuts and their own washer as part of the kit. Stock headstuds need to be 135mm to use with the barrel nuts. I believe that you bottom out the ARP head studs. Do a search as I know this has been discussed here before. I would contact ARP for correct installation as each vendor their own instructions on how it's done. I used red loctite on the factory steel studs on my rebuild as Porsche uses the same. 
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Michael
88 911 Diamond Blue CE Carrera 3.4 HC3.4 member
2020 Honda Passport
Last edited by 88-diamondblue; 06-14-2006 at 09:18 PM..
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