Run electric fans all the time?

Thanks. That is also my current diagnosis :)

Aren't there only two ratios for the B/RB, either 0.95 or 1.30? Anyhow I'm going to try the high flow pump and see how THAT goes.

How big an engine are you successfully cooling with the Contour fans?
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BINGO !
I`ve been wondering about the engine sizes in these posts , 318 / warmed over ? 340/ warmed over , warmed over 440 ?
Or an all in street 500 plus inch engine in a tiny engine bay . Makes a hell of a bunch of diff. !