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""""The ARP instructions are usually pretty good and i'm surprised they don't make any mention of the domed/unthreaded tip side of the stud being inserted into the case.""""
A good point. I'm not surprised that this was unknown in the DIY world as many so called Pro builders are obviously unaware of this by virtue of the direction they install the studs or they don't have this feature added to their aftermarket studs.
In the "case" of these Porsche engines, installing all 24 head studs the wrong way around and bottoming them, a common mistake, the main housing bore will distort and the oil clearances change to the main bearings. Now torque the heads with the studs backwards and the studs bottomed out and you make this problem even worse.
Installing head studs should not be considered a simple procedure, but a very important and complex assembly as they have a huge effect on other parts.
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