Ohhhh your going to get a lot of argument on that one. It is HARD to hurt a 4340 crank. The service life of a quality product even at 6800 makes it WELL worth the investiment IMO. I won't argue that there is a LOT of 'monkey see monkey do' in this hobby and that keeps the aftermarket a multi-billion dollar industry.<font face="Arial,Verdana" size="2">. If you spend money on a 4340 anything and dont rev it to 9000 rpm, hit it with a 500 horse shot of nitrous, or 25 pounds of boost, you just wasted a TON of money. </font>
I've beat on GM parts and high dollar aftermarket assemblies. I can tell you when something 'does' break (and in racing something is eventually going to give) the residual damage to other components is minimized when things stay together. Things stay together when the material is strong enough to retain it's shape even tho the forces are trying to rip it to shreads.