Originally Posted by KNIGHTRACE (Post 11239836)

I was asked for my opinion on studs by a few people recently. The most important thing in studs is the proper expansion rate in relationship to the motor and of course not breaking. I have used stock steel studs, 993 TT and supertech studs with good results.. I have had ARP and RACEWEAR give problems from not enough expansion. That being said it depends on what the motor is used for and what the power level is. If you building a 200 hp to 300 hp street motor even ARP or Racewear will be fine.. It also depends on the case, 993/964 have O rings and no copper base gasket to crush and cause leaks.
I use the 993 TT on my higher HP builds because I have very good results with them.. The supertech stud could be as good or better in that application I just do not have the experience with them north of 400 hp to say for sure. I have used them in 320 3.6 builds and a few 3 liter to 3.2 motors. They look like a good stud, The advantages they have like install after the piston and cylinders are on is probably helpful to a nonprofessional engine builder. I put them in before P&C so little to know difference. I have used the 993 TT on a 3.5 liter turbo motor I ran at 2 bar of boost with no issues.
if your building a mag motor I suspect the supertech stud may be the better choice due to Henry putting in much more time and effort than even Porsche did. If it doesn't expand enough on a magnesium motor you pull the stud from the case not break it. Henry has had 44 years to improve the stud on those motors when Porsche stopped, I have a similar advantage on camshaft design, I have had about 25 years of development and testing since Porsche quit.. These advantages or advancements made by small shops like Mine and Henrys and other shops help the enthusiast today. It give you good choices.
Summary, there is a time and place for everything and you have to factor cost vs benefit.

Originally Posted by KNIGHTRACE (Post 11240130)

I have plenty of heart, but I am allergic to drama. I personally had rather encourage or help people not tear them down. This is not directed at any one person, I am just trying to explain why I do not wish to engage in these threads where it seems like a drama show to me.

Originally Posted by KNIGHTRACE (Post 11239836)

I have used stock steel studs, 993 TT and supertech studs with good results..... That being said it depends on what the motor is used for and what the power level is. If you building a 200 hp to 300 hp street motor even ARP or Racewear will be fine..

Originally Posted by 911pcars (Post 11241473)

Can we get back to anecdotal opinions? :-)

I decided to use (actually reuse) the 993TT Dilavar studs because they would cost too much to replace in kind (~$40-$60x24) or switch to the alternate studs discussed here. It came with the engine I touched up a bit. How's that for being "helpful"?

Sherwood

Originally Posted by Henry Schmidt (Post 11241746)

I'm guessing by the pictures, that's a 2.7 engine. Using what you have is always a reasonable option if engine longevity is not priority. I noticed that the case doesn't have CaseSavers so limiting clamping force will help prevent stud pulling.

Just for fun, if you haven't already rebuilt the heads, can you post a few pictures of the sealing surface?

Originally Posted by 911pcars (Post 11241851)

Hi Henry,
It’s actually a 3.2. I may have to risk that possibility. I’ll keep my fingers crossed though.

Originally Posted by Henry Schmidt (Post 11241871)

Well I missed that "2.7" guess. Of course studs pulling on a 3.2 is not an issue.

Any chance of head pictures?

Originally Posted by 911pcars (Post 11242100)

Yes. Took a little off +.

Originally Posted by 911pcars (Post 11242187)

Why? To clean up the sealing surface and to incrementally increase the compression ratio. I recall 0.025". Oh, and a set of 964 cams in the aforementioned 3.2.

Years ago, I did the same with my modified 2.0>2.7 w/S heads with E cams and RS pistons and their optimistic 8:1 CR. It worked fine if not noticeable

Shouldn't have? If I asked if I should have done more, might I have expected a resounding yes?