So i remembered something I learned a while ago about Thermal Conductivity of differt types of metal, so I did some research and have come to this conclusion...
Copper has the hightest thermal conductivity of all the metals used in radiators at 401 ( W/m * K ) while aluminum is only at 237. In fact only Pure silver has a higher rating than copper at 429. That does not mean that aluminum is not good as it is # 4 on the list behing Pure Gold at 317, Imagine that a Pure Gold Radiator - Bling, Bling. Any way to make my point, if you are build a mild small block, say under 300 hp than a copper radiator would be fine. Now if you are going more than that go Aluminum, not because of the metal or the weight, but for the fact that most Aluminum radiators use Larger tubes than stock, meaning more surface area, which means better cooling.
Ok Science class is over... The nerd will go away.
