I've done exactly that, (the grid of jet holes), now on 2 different blocks, and with somewhat predictable results.
try and position the jet's so they fire at the center of the divots and you'll be set, use 2mm dia jet holes if your pump is around 1.5-2m head, use 1.5mm holes if it is above that.
Oh and they perform well enough that I'm currently using one over my micro pin block.
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feel free to icq/msn me, I'm always willing to toss around ideas.
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