Radiators: Is 22" enough for 400 HP?

RPMagoo said

I have a 22" radiator in a 408 - 69 Valiant. - H.P. is around 450 - 2 row alum rad - 1" tubes - shroud - 7 blade Mopar fan - And overdrive on the fan/water pump ( larger crank pulley - smaller water pump pulley). Cools, marginally, with 50-50 anti freeze & water. - If you need more cooling then run just water with some lube like Lucas or _____. That should be your choice in Ca. i.e., no anti freeze.

Click to expand...

Cools marginally? That worries me right there. I have heard that running straight water isn't a good thing because a) anti-freeze has rust inhibitors, and b) it lowers the boiling temperature.

What brand of radiator do you have?

FredS said

I have a stock tank 22inch with a 3 core 5/8 tube rad, with clutch fan and shroud and my IMM built 408 pushing close to 600HP, and it stays under 180 with these cooler temps, and have never seen it go above 200.

Click to expand...

Hmmm...so that stock tank is probably brass right? So is that better than aluminum?

Ok, I'm curious to see what others will chime in with. I'm hoping to place and order today or tomorrow in order to have it by the weekend to do some work.