So you have some identical engines that differ solely in the rod side clearances, and the ones with tighter clearances have more oil pressure? NOTHING is different but that? Same operating temps, oil viscosity, brand, etc. etc. Please provide more info here... If I'm wrong, I'd love to know why other than just claiming "real world experiences". (The plural of "anecdote" is NOT "data").

Also no disrespect intended, of course, but I've met far too many people in my life who know things that just ain't so...