I had a black magic on a stock 3 core in a 66 mustang but, it didn't cut the musterd after a aluminum head swap. I now have a griffin alum radiator with a 16" mister gasket elec. fan in front and behind the radiator. Each fan is good for 2000 cfm. Mr gasket wasn't my first choice in fans but all that I could find that would fit after the new radiator. No problems so far and both fans will run off 1 thermo switch.