Copper and brass radiators cool better than the same size aluminum one is what I have found shruggy work
I swap Griffen 4 row cross flow copper and brass radiator to similar size little bigger all aluminum up right and the new one did cool better for one summer, the next summer I had to have it cleaned out by a radiator shop before it would cool good again like the previous summer shock rant whiney down

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)