Engine gets too hot at idle

[Garf]

I have a stroked 528ci engine making 700 hp in a 1970 F100.  It stays cool when moving at 180 degrees, but sitting at idle the engine temp keeps creeping up.  It's been up to 210 before I've shut it down.

It has a 3 core aluminum champion radiator, high volume Edlebrock mechanical water pump, 17" Derale flex fan with a shroud.  Flex fan is about half in and half out of the shroud which puts it about 2.5-3" from radiator.

Looking for ideas to solve but thinking of 2 13" electric Spal fans that pull 1777 cfm each with shroud to replace the flex fan.  I have a 140 amp alternator.  Each fan draws 24 amps.

Thanks in advance for any advice you're willing to share.

[sixty9cobra]

I have the Spal fans and they do a great job. I also had a champion radiator and it didn't cut it on 464 cu.in. I bought a Summit 3 pass rad and it stays at 180.

[My427stang]

Very rarely is a flex fan a good choice, especially as you make more heat.

Assuming you have the fan spinning 1:1 or faster with pulley sizing, the best fan for keeping them cool I have seen is the Flexalite race fan

https://www.summitracing.com/parts/flx-101584

I am not an electric fan user unless you can use a very effective fan.  Two 13s seems very small to me

[Drew Pojedinec]

When I first started using my engine I had same issue.
Realized the water pump pulley was under driven, getting the correct one helped a lot.