max your block on the first picture all the way on top performed the best for good reasons:
first, although it may not be the nicest looking it has something that many (even commercial) blocks don’t have and that’s distortion of laminar flow... smooth flat surfaces may look nice but they will never perform as good as that block due to effects of laminar flow
in addition to good turbulence it also has wide channels for a good flow of water and large amounts of water
i have seen many blocks out there but simplicity always seems to prevail...fancy CNC machining can many times be outperformed by the good old drill press
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