[Cracker]

Fatboy - It is my understanding that you would absolutely NOT need a steel crank for that power level. Secondly, I've been led to believe the true benefit of a steel or forged crank is reflected when spinning the motor extremely high. On that note, however, I've heard a couple "builders" claim to have used cast cranks all the way up to 8K rpm's! Someone with a better understanding will hopefully respond for you.