Blown big blocks

TOY440 said
A mate of mine here down under made 1500 hp with a standard block. Was grout filled though, engine has been running for the past 8 years

Wondering how hard and how often he really hammers it for all its worth. I wouldn't think it would last a season in a dragrace car .
idle to 7000 and hold it for 8-10 seconds every time u start it ??????????