[greenman100]

misinformation in this thread is running buck wild

AA an easy target?

Ruiner's not helping either

First, to further define the goal:

Low restriction for a weak pump/multiple block situation, the justification could be there

the pro/testing page will not help you, as pressure drop figures are not available.

now make an educated decision, obtain pressure drop information for the said blocks, overlay pressure drop curve of waterblock, with fudge factor for rest of system on top of pump curve, take the data point at which the lne cross, go to C/W vs. flow, then start comparing

if it sounds too complicated, go to OCers, they'll spoonfeed (mis)information with no qualms
If you decide it's worth the effort, keep posting here