I am a big believer in aluminum radiators. I read somewhere that aluminum cools 40% better than brass and I'm inclined to believe it. A few years ago, when I was still racing stock cars, we had trouble cooling the radical small block in our sportsman Camaro. We were using a big 4-row radiator out of a Cutlass deisel. We tried different size restrictor washers, different water pumps, different fans, different shrouds. Nothing seemed to work satisfactorily. At the end of a 25 lap feature the temp would be 240+. We finally put in a Howe aluminum radiator... and we had to put a thermostat in the car to get it hot enough to run right!

As usual, nice looking work, Don. Yor attention to detail is inspiring.