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Porsche engines are air cooled, that limits them to about 320 HP for a reliable engine. There are people getting over 600 HP out of air cooled Porsche engines, they all have a nice, pretty coating on the exhaust system, thats consists of melted piston material.
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I dont buy into that statement at all.
I have built or helped build some pretty powerful engines:
3.8 Turbo approx 900 hp (racecar, 935 clone)
3.3 Turbo approx 600 hp ( this is a street 930)
3.4 NA 374 rwhp (racecar)
even my humble 2.2 puts out some good hp for a small displacement motor just about 200hp ( in a 1800# racecar)
on all of the above engines EGT and operating temps are closely monitored, and mixtures are set to keep combustion temps reasonable. You can make some serious power with the porsche engines if you keep track of mixture, timing and oil temps.
Most of the failures I have seen on high output engines are mixture or rev related. That 12000rpm downshift makes a bunch of schrapnel pretty quickly
