Quote Originally Posted by JJ91284 View Post
Metal doesn't care how much power you put out. I would bet some serious cash that a 4340 input shaft could handle 600 hp. If the power is gradually added its fine, if the power/torque hits HARD, parts snap. It doesn't care about hp, it cares about shock load. This is a very important concept in structural aeronautical design.

Sometimes you just can't polish a turd, that being the 4340.

600 HP huh? LOL, ok. I'm sure the many others who broke them were putting out around 600 HP too...