Champion radiator - I cut her open

1967formulaS said

Cut the top and bottom tanks of my old champion radiator that was in my 440, 67 barracuda.
The cores are tiny. I could barely fit some 0.6 MIG wire through.

This rad was setup with a shroud and twin 1300cfm fans. Still didnt work.
I'm planning on buying a decent core and making a twin pass with some spal fans and another shroud. Maybe 2x low profile pullers and 1 big arse pusher on the front.
Thoughts...

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Radiator isn't the problem at all.

Two 1300 cfm fans, for a possible max flow of 2,600 cfm, is totally inadequate. That's like maybe 2/3 of the airflow you need on the low end. The stock mechanical fans are capable of somewhere north of 4,000 cfm. And are they pushers?

I run a champion 26" 3 core with an OE Ford Contour dual electric fan set up. Those fans are capable of ~3,500 cfm on low speed, and ~5,000 cfm on the high speed. That combination cools my .060" over, 400-ish hp 340 just fine. I use a digital controller, and the high speed has only kicked on a couple times, all when sitting in traffic with ambient temperatures above 105*F.