ok stroker guru's, gig this one

it's the side loading due to angularity [at 90*] from a poor rod ratio with the 4'' sb motors.

also pin location which keeps the piston more stable in the bore, mopar tall decks allow long rods to be used=good rod ratio, along with taller pistons/lower pin heights/pin bores.----ring stability
higher nickel blocks could fight this [cyl wear] better but the majority are not.

if you wanna rev the snot outta something build a motor with a 1.80 or better [1.80-2] rod ratio.