Classic Roaster Cooling

[CobraEd]

This has been an ongoing problem since I bought the car as I recall. I think even before I put on the Edelbrock heads. It runs marginaly OK around town if the fan is on nonstop. Temp will go up if I "get on it" On the highway at higher engine RPM and load it will run about 200 gradually creaping up to 220 or so even though the wind is blowing thru hard at 60 -65 mph. Once it gets hot it takes forever to cool back down. It will puke after a highway run, but now I have 2.5 quart overflow tank so it pukes into that.

Anyway, here are the other details. I have the standard Classic Roaster custom radiator. It appears to be 4 core, but not the normal 1/2" cores. It has these friken microscopic 1/8" oval shaped cores. Very small. Over the years I have added a Mr Gasket High flow thermostat, a 2.5 quart overflow tank and a Mr Cool high flow water pump. No difference. The car has always run great from a performance standpoint. Timing is pretty advanced, but the car runs great. I have a 16lb radiator cap.

One other thing, The car was originaly built in Florida and as such the guy never put any antifreeze in it. So there was a lot of rust in the cooling system. That was years ago though and the cooling system runs clear now. But I suspect that the combination of the microscopic radiator cores in conjunction with the past rust scenario, I may just have a bad radiator. I just ordered a new dual 1" core aluminum radiator from Summit (26" x 19", but I just get a bad feeling that this might also be a head gasket due to the periodic bubbling and puking into the overflow tank.

Thoughts?

Ed