It was on the car when I bought it so I don't know what it came off of originally. I thought it was steel but I guess it is brass. Not only do I not know about metals, I also can't count. This is not a 3 core, it is a 4 core. It is exactly like the stock radiator in every respect with the exception that it is slightly thicker to accommodate the extra cores. I think I have a buyer. He has until Monday. I'll put you in line if you want. Also I do have pictures but as I told my potential buyer, the pictures look like crap. The flash makes it look bad. It is very nice. I'll send you the pics I sent him but don't put much faith in them. They don't do this nice radiator justice. I'm going to power wash it over the weekend and paint the tanks, I send better pictures Monday.
Gary