Mfgr's specs for restriction of blocks (rads and res's too) would be great.
went through the following machinations to approximate the flows I would get by replacing an Eheim with an Iwaki. The only info I "knew" was the flow rate of my current system..the rest is easy if you have pump curves (which are available for most).
Flow resistance for some blocks (and some rads) is available as stated above, but it takes alotta digging. And doesn't account for your specific tubing (size/type), barbs, and routing.
Nor does it account for the barrametric pressure, phase of the moon or currency rates at the time of the testing...sorry, can't get \\WING// out of my head!
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