As for the 500's.. This is probably all conjecture anyway. Dont they start wearing out cranks and cases in a hurry when you are approaching the 90 hp mark?

The ware is accelerated everywhere on an engine that was designed to be reliable at 45 Hp stock and now the power is doubled even though it was considered a high performance engine stock. 

Is the ware accelerated on the crank and engine block when a knowledgeable engine builder gets his hands on a stock 400 HP Corvette engine and turns it into a 800 HP NASCAR engine?