This was the primary reason for the "center plate" in the design, and the reason that the mounting holes were in the center of the block when viewed in profile. The nozzle does create flow resistance, but it also accelerates the flow similar to what you get when you use a nozzle on a hose. When you're spraying that hose farther, you're getting less flow than when it is just pouring out the end, but on the other hand, it can pound a surface harder when sprayed than if the water is just dribbled across it normally.
This helps ensure that the coldest water possible is located on top of the hottest part of the block. The faster flow also helps push the newly warmed water out of the way for fresh, cold water from the jet. By lowering the location of the nozzle toward the baseplate of the block, it ensures more direct pressure against the die area.
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