Originally Posted by Chip

Actually the opposite would appear to be true from what Ive heard of Karl's research (have only heard 2nd hand though as not ever spoke to him personally about it)
He claims that the block is pulled out of shape by the long studding, to the extent that the mating face is no longer flat after a long period of use with longstuds, and obviously is the face is warping due to the block moving, then the bores will be too.