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For a 600hp engine there is no "best". All the $750 or so 4340 cranks come from the same forging dies, just different machining and not so sure about that!

The real answer to your question before you limited power output would be someone like Sonny Leonard or Winberg.

R.

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Sonny Leonrard or Sonny Bryant? OP, 600 HP on a Mopar wedge storker motor is not hard to do Plus you don't need a really good expensive all out forge steel racing crank to make that or live a long time as long as you build it right Get the oil clearances right and so on and you don't detonate the motor from tuning or bad fuel OP, how big of a motor are you wanting to build? Which heads, fuel and compression ratio? Lots of choices out there, a few gremlins also