I bought a replacement radiator from one of the online places (don't remember which one) and although it was brass and not aluminum and therefor should have been better at cooling it was not. Upon inspection I found that the fins were not made of just brass/copper like an OEM, they were instead made of plastic embedded with two thin brass strips (~1/16th inch). These two strips comprised ~20% of the total width of the fin. This made for a radiator that performed it's worst while crawling or stopped in traffic. At freeway speeds it was OK. I replaced that radiator with the all aluminum radiator from ebay I posted the link to before. I have had it for over two years and it has performed so well that I purchased another for my 2wd turbo project. Only a few thousand miles on the turbo truck, but not a hint of trouble so I expect it to perform well.

1stgenboy