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Scott,
the reason Porsche started using Dilavar for head studs were the magnesium engine cases. Magnesium does not require high clamping forces to pull the threads out. Which also explains the extremely low torque value on the head studs.
Realistically Dilavar is not needed on aluminum cases. If you believe otherwise, look at all the motorcycle engine cases and now modern automotive engine cases that have had no problems with steel studs. As far as bore distortion is concened, look at all the Busas, Gixxers and ZX14s with big turbo kits that use APE or ARP racing studs with higher than stock torque values. No problems with cylinder deformation and boost/horsepower keep climbing every year.
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