451 overheating, even when moving

Demonx2 said
FWIW...cools my 408 in the avatar on the streets. 10.5 CR, runs low 11's. Champion 22" radiator. I sealed all the "overlap" openings you see before I installed it. Basically, all the air has to pass through the rad and through either those 2 fans or the rubber flaps that open at speed. I rarely run both fans, usually 1 is enough. Unless sitting in traffic in 90+ deg heat, then I'll flip both fans on. In that type condition, temp will stay below 190 idling as long as you want.

At the track, 1 fan is sufficient. Fan assy is a Jegs 555-52115 which is a Maradyne MM22K fan assy. What I cannot tell you is how much or if the 6-pack scoop also helps. I suspect it doesn't hurt!

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That's a nice setup. Understand when I say this, I take NOTHING away from it whatsoever. However, you have one HECK of a radiator if it never has idle temps above 190........and I believe you. "Most" high performance engines do require that magical "around" 4000 CFM number in order to keep cool at idle or slow speeds. That's a nice install you did blocking the overlap areas as you say. Most people don't think of that. Do you have pictures installed? I'd love to see it. I'm sure it's a neat fit.