Well, when talking about radiators, Brass radiators get a bad wrap for some reason. I think it's because they are heavy but they do cool extremely well. I think the reason why aluminum seem to cool so much better is solely because they are lighter and therefore can be made bigger with a larger cooling/heat transfer area.
As for cores, I haven't actually seen any aluminum heating cores. Do they have to be made bigger to transfer the heat as well? If they are bigger, will they still fit the existing area? I like the fact that aluminum doesn't rust so hopefully they would be more reliable requiring less times to be replaced?
