You must know something I don't then JayDee. I have only used one hc-style radiator (my single pass from the Chevy C10) that DIDN'T need to be turned on its side and shaken a bit to clear totally of air. Even the 1pass Blazer hc I use for testing benefits from a tipping to get the air out of the tank. Now I see plenty of sideways mounted HWLabs rads (dual BIMs; BIX and Pro mounted in front of cases) and clearing the tubes that are higher than the outlet of air would definitely be an issue. How can you think it wouldn't?
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