Clutch vs. Electric Fan

I have been having the same problem. I have spent tons on Be-Cool fans and also oil and trans coolers. This is the second motor. The first was a X-block W-2 Batten head 428. This is now a Resto block Indy head 428. Still running hot. I tried everything from pumps to restrictors. I even had a aluminum air dam made to push air throught the rad. The rad flows water fine.

I finally found the problem. Somewhere in this rads life it was over pressurized. The tubes are now round and air does not flow through the radiator. I noticed this by accident when getting out of the car with the hood open and the fan running i didn't feel warm air hitting me in the face. My other car the fans blow your hair when the hoods open. After some investigation I noticed that you can't see light through the radiator in the middle of the core.

I got this rad used. So it could have froze in the past. Or I could have done the damage when I blew the head gaskets on my blower motor. I was playing with pullies and blew the hoses off when the gaskets blew. This is just a heads up it could be the rad. Aluminum rads. are great but they need to flow air.
My radiator looks like new but it is junk. Just a heads up to all. Steve