After asking and asking and asking everyone from local PCA members to local track road racers, I was repeatedly told to go to a local European Repair shop and ask for Phil, the shop's Porsche expert. So went there and asked for Phil. I told Phil that I was in the middle of a complete rebuild of my 1980 3.0L SC and I had several questions. Phil put down his tools and talked with me for about 45min. He answered ALL my questions and then gave me a long list of tip and tricks and even showed me examples on an engine he was working on (a great guy and endless base of knowledge).
Anyway, one of the things that he suggested and he had even put in his own 2.7L rebuild were, “Full Thread, Non-Magnetic, 993 Head Studs”. He said that he had used them on many engines (even race engines) and had yet to see a failure. He liked the expansion rate of these studs, especially with the Cold to Hot to Cold changes that we can see in late October/ early November, here in Michigan. He stressed,
DO NOT use the Dilavar studs that were on the original exhaust side of my 3.0L (I had already planned not to).
Anyway, I went to the Pelican Part On-line Catalog and looked for these (suggested) studs. Guess what? The webpage (
http://www.pelicanparts.com/catalog/shopcart/911L/POR_911L_ENGpis_pg7.htm#item31)
says this “Cylinder Head Stud, Mounted into case, (24 required, sold per each), 993 - fully threaded, DILAVAR, 911/911 Turbo (1965-98)” ……DILAVAR????? .....and at $$38.25 each ($918 for 24 set)
….he told me that these were less expensive than Raceware….?
Another question is that if Porsche knew that Dilavar studs had issues, why would the 993’s have them? Were the , “Full Thread, Non-Magnetic, Head Studs” used in production on the 993’s?
I am going to go back and ask Phil to clarify. However, are there different “Full Thread, Non-Magnetic, 993 Head Studs” than the ones on the Pelican page?
If anyone has info, please post.
Broken (original) 1980 3.0L Stud
Thanks,