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Alot! If I'm not mistaken a few have reached close to or at 1k at the flywheel. I could be wrong thought, but I do know that they can and have made some serious numbers.
so if i build a 450 to 500 rwhp motor plus nitrous like a 150 to 175 shot i can use my stock crank and it will live
I would worry about some other lower end components before I'd worry about the crank. The 1000 HP seems to be a popular number, but don't know anyone running that type of power on one.