I have an aluminum 3 core, in my 1984 C-10 with a built small block, and never owned an aluminum radiator before. The engine has an high volume older USA made Wiend water pump and the engine has a hard time getting above 150. I had to block off part of the radiator. The representative of the radiator shop said I only needed a 2 core, he was right. Too cool of an engine is a nice problem to have. I firmly believe aluminum cools better than my old brass radiator.