Don`t assume that Chevy`s or Fords are immune from this either, I was up close and personal with a carillo crank and rodded, billet 4 bolt cap (not splayed) 14:1 355" small block that routinely sees 8000 rpm, a while back, that if you were to take a picture of the mating surfaces only, you would swear it was a BB mopar
I absolutely agree with MD and andy also that it is a combination of issues, Bolt clamp force, Block flex, etc...As Andy said..it really is amazing that they take what they do, considering the crudeness (is that a word ?) by todays standards on how they were designed.

Rick