So, you claim to be an engine builder and you don't believe bore distortion exists because you can't measure it with a BLOWBY METER?! Holey Snikes!
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Originally Posted by BURN-BROS
That thread is completely theoretical and dangerously close to mental masturbation. It’s easy to postulate the scenario, it’s another to actually quantify it. With close to 50 years of air cooled Porsche engines running around with a variety of head studs, you would think that there would be consensus. If bore distortion was a problem we would have seen it on a blow-by meter on the dyno. Since we do not, the theory is moot. While 993 Dilivar can do the job, Henry’s studs are a great alternative and fit nicely between steel and Dilivar as far as expansion rate.... if you feel that it’s a factor in your decision. Run what you feel like using,
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