Gotta chime in...
Gone_fishin: I understand your point of view, but I think that you're forgetting that WebMedic's testbed, as flawed as it may be, will still show the difference in temps between blocks. Any test bed will have an offset, but all testbeds should show the same temp difference, from block to block.
Overall, I see a lot of dancing around the issue about finding out which block is best, when the reality is that a lot of blocks can be made to perform equally, with different flow rates. I think that BillA has proven that already.
So if this is going to be a block roundup, then what it really is is a close-up examination of its performance curve, at different flow rates.
As for WebMedic's testbed reliability, I have a few concerns myself. I'd like to see a detailed writeup of the procedure, a writup so detailed that even a child could follow it. IMHO, labs operate the same way. I would also introduce a random element, just to attempt to validate the results: don't run 5 consecutive tests on a block, then move on to the next block: run 1 test, then change block.
The flow rate is going to be important, because each block has a performance to flow rate curve that is unique. That's the tricky part.
As for real world results, the different lenghts of tubing, rad and res selection will greatly affect the flow rate, so you can't even really test a rig with standard pumps: all you can do is report the blocks curve.
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