[DMXF]

Pop - If the outlet holes to the head were relatively small in relation to the capacity of the pump to where the block ended up being pressurized essentially equally from front to back and the passage restrictions were negligable, then yes the flow into the head would be proportional to the hole sizes. I suspect this scenario isn't quite the case and that there is some tendency for the front holes to favor more than it's share based on hole area alone - this suspicion is reinforced by what has been found with other engines (evident via internet searching).