Coolant flow

You guys think cooling is simple? Just as an example: line up all the V8 blocks, Ford. Chry, Chev, Pont, AMC etc. All sizes. See if you can find two the same that have the same number of coolant holes & in the same location & the same size.....
That tells me the engineers had different opinions & probably did lots of testing...& the final outcome was...they could not agree....as evidenced by the fact that every engine has a different coolant flow layout.