M10.
De gewone stalen van Porsche komen op een 120 euro per 12, als ik me niet vergis.
Robbie

Stress concentrations aside, the Dilavar studs were not robust enough to hold up to the stress exerted by the larger displacement 3.0L and 3.2L engines. So the big question that many people ask is “what stud do I use?” Based on the consensus of Porsche engine rebuilding experts that I’ve asked, it would seem that the original steel studs used on the early cars are the best bet for use in rebuilding any 1965-89 engine. It is very rare to see these original steel studs snap and break. They have also been used in many 3.0L and 3.2L engines without any reported problems.

At the expense of starting a war, there appears to be two minds regarding studs. One is to use steel studs, with varying choices including Raceware and Henry Schmidt's studs. Second is to use 993 Twin Turbo studs, which apparently are a better dilavar material.

I get confused personally, both sids of the argument appear to be valid in that there are very few stud failures with either of the two approaches. The more modern steel studs have lots of great experiences out there, but then again, the 993's did not have any stud breakage issues that I have heard of so they are obviously successful as well. I can see the value of steel (nice and strong), but then again, they are compressing what essentially is an aluminium column, so the dilavar's expansion rate, which is similar to aluminium, should maintain a more consistent clamping pressure.

only use 12 diliver studs on the bottom row the top 12 would be steel