i measured the big end widths but didn't measure for taper; i'll look at that. the bearing bore sizes fell with in spec and are a little larger than the medium dimension, typical of all chinese rods i've measured. the bearing locating tab notches were off on a few rods but i think it's fixable. i didn't like the 7/16" arp rod bolts. i think they'd wreck the rod if ever taken out and the machining was a little rough were the cap located on the rod.