I'm wondering Jaydee if you used the roughing end mill on the Kingpin?
The irreguler surface of the pins done with a roughing mill would tend to reduce flow, but would also offer more surface for better cooling.
Be interested in seeing the outcome regardless. And while your test bench isn't all you'd want for doing block testing to post reviews with, it's still better than what the vast majority are useing that ARE posting review articles now on the web! And it'll give you a start on doing comparison testing. That experiance may help you choose further improvements for your test bench.
Luck with the testing.
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