360 Advice Needed - Autocross / Street Engine Build

Kicker92 said

It's a brand new Spectra CU526 rad though, that should be clear and free flowing.
I agree though, the lower tank should be cooler than 9° from the upper tank.

It's the 5 blade mechanical fan, with the Hayden viscous clutch.
The clutch is spaced about 3/4" from the rad fins, and the fan sits about 1-1/2" back.

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No shroud though? That would help a little, but, like I said that temperature drop is terrible. I'd expect a small improvement with a shroud, but not a 20* improvement.

Point that FLIR at the radiator, see if you have any cold or hot spots that would indicate uneven circulation. Just because it's new doesn't mean it's good.