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All the 935 heads I have seen (pictures on internet) have been of regular alloy, not RR350. Those heads survived for 24 hours at 600-750 hp. Porsche probably decided on the RR350 alloy on Turbos, expecting their European customers to be cruising on the Autobahn or the like at very high speed for extended periods of time. The RR350 alloy probably gave them the added safety margin needed to let their cars run for 75,000 miles or more without needing to rebuild the engines more frequently, which would be unacceptable. This is of course just me second guessing why the factory did what they did.
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