What are the differences between a 2 and 3 core radiator? call me stupid? So, I need to get a new radiator for my 35-ford truck. I was looking at the 65-66-mustang radiator. So, I went to Advance auto where a student of mine works and he let me look threw all the radiator books. I found a Ford rad. that has the correct inlet and outlet for my sbc. Its a little different then the mustang rad. But the radiator is a 2 core. Want does that mean ? Here is what I working with sbc, electric fan, electric thermostat with a clutch sensor. Is a 2core a Bad choice? Thanks for your help Oh. The rad. Im running now is a 3-core aluminum. That was made for a flathead and I plugged the other two outlet. Thus voiding the warranty.