Got a reply back from.onpoint dyno about the 370z crank on his 9,000 rpms 350z
Elijah Morris Yes in endurance racing the 370z crank can not withstand extended 8700+ RPM use. However, for how little we run this engine the OEM crank is fine for 9000rpm. We generally don't leave the engine alone for more than 20-30 hours of run time, so it's not of much concern to us. However, real endurance racing teams have since switched to a forged crank for extended use, and most significantly the durability to withstand some driver-error enduced over-revs to 10,000+ rpm."
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