I have seen some stuff on the forums about the rods in certin 7.3's will fail around 450-500hp. I have an 02 that im planning on making a 500hp truck. Thanks for the help. :bang
They will break at around 400 some guys get lucky and go further and some break at almost stock levels so no way to know for sure. Fordguy24 on here just had a bad experience with the pmrs in his truck to put it mildly and he was only in the 300 hp range.