We have magnafluxed and zyglo'd thousands of engines through the years and just about never find main bearing web damage in engines that came from vehicles with anywhere near stock engines and tires. The pulled main webs are usually from sprint cars that were running on a very sticky and rough track---getting air born and coming down from 7-8k rpm to a near stop instantly will do the trick. Pull truck/tractor engines that run on a max horsepower track where the weight shut them down, and believe it or not boat engines. I guess the right prop is like a big tire on a sticky track and they do get a lot of air time. This is usually hand in hand with some kind of boost although turbo engines seem less prone than roots type blown engines.
