I wasnt trying to steal the post and take it to an automotive area, but using this as an example to explain what proper blueprinting was and why all engines arent the same as the original blueprints.
 I did do 1 block once for a person that came out at around 9.675, had a 4.125 bore . That aint too far off 9.75 . Was out of  a truck as I recall.  Those pistons when I lifted the lids were a lot more than 3/16 down the bores, top ring damn near half inch down. 

 If you go right into it I think you will find in block designs all sorts of modifications to cam heights, crank diameters, bores , web thicknesses, and the list goes on.

I havent rebuilt car engines now for quite a few years ( fix caterpillar now) but memory still pretty good.