I realize that this is also torque dependent to an extent, but my question is if anyone has broken a stock crank? If so approximately what RPM? Im trying to figure out if I balance the engine internally, so that there is no longer a 50oz imbalance on the flywheel, and all of the rods are equal, etc, etc... how high this baby will rev before I snap the crank. If anyone has any insight at all, please let me know. By the way, I am slightly inquisitive about this, because Summit and others sell cranks that spin up to 7000RPM, but that is not much higher than the stocker... I have not seen any that spin to 8 or 9, but have heard that racing cranks which are about a $1000 do...