It does make sence to have the water go through as fast as possible so it doesn't heat up much before it leaves the block so that you get a good T delta all the way through. The nanoblock is exactly what you sugested. Also older cross drlled blocks work like this too. However surface area is also another factor in heat transfer. Get both high and the block rocks. Unfortunately getting both is difficult so you normally get a compromise. Brad's block has good surface area, from the fins mostly, and he should get good flow rates too as he'll have a large effective bore size,from the parallel nature of the block, shorter path length and rounded corners.
Brad, the pic at the top, is that showing layers of a single block or the evolution of the block?
Edward
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