You have it Allen. One more bit of information. The blocks and heads have smaller holes up front then they do at back of the block ( or less up front and more at back) for coolant transfer from one to the other. Since water takes the route of least resistance, you have to choke it down up front to be sure you get enough coolant to the back of the block. If all the holes were the same size, water would flow in the block and right up and out without ever getting to the back, then you would have all kinds of heating issues.
Not knowing much when I younger, I opened up all the water holes in Pontiac V8 thinking how well the water was going to flow. That engine ran hot all the time, I know why now, back then I thought it was a thin casting or poor tuning.
Joe
