This test isn't really all that hard to understand.
I could see how the flow restriction differential between the two blocks could be amplified or reduced depending on pump type used, and how that could translate to differences in final performance as the flowrate through the radiator changes... but seriously folks, this is pretty damn straightforward data. I don't really see any reason to question it in itself.
Sure, a scenario which more accurately represents an average WC loop may provide more useful data, but without control such as in this test, it might not either.
At best I find this to be a comparison of the two block's performance under controlled conditions, and at worst I find it to be sort of interesting. No reason to go calling BS and such though.
Gabe, what coolant was used in the test? It probably would have only minimal effect but a heavily glycol laden coolant could amplify the restrictive effects of the 350 due to higher viscosity. The flow resistive effects of a higher viscosity coolant would be amplified in a high restriction block while in a lower restriction block they would be minimal. It would be interesting to see a test with pure water and then a heavy glycol mix (just for fun if anything).
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