I think what he's telling us, is he has built it to very tight fitting specifications and made several mods to it I assume. High HP engines tend to not last as long as mild mannered engines. which is dramatically affecting the life of the piston, as well as other components probably. I think he mentioned you could hear it slapping when at idle from the small tolerances.  At least that's what I'm understanding. It must make some incredible HP to wear that fast.