Best hydraulic flat tappet lifter?

Here at Crower we EDM a hole on our mechanical lifters and for our hydraulic lifters we make a slight flat spot 0.0025" on the side of the lifter to the oil band. only on the lower half of the lifter. As the lifter rotates it pumps oil across the whole cam lobe. Now all of these high lube lifters or EDM holes will drop the oil pressure on average 1-2PSI. That is not much but some people are crazy about 80PSI and if they drop below that they will pull apart the engine. Anyways here is a link

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