When comparing copper vs aluminum for heat transfer, the material's heat transfer properties are overrated. It's the aluminum's strength which allows for larger tubes spaced closer together for more *total* area for heat exchanging. The more surface area you expose to cool air will cool the water better.
http://www.caparadiator.com/aluminumvscopper.html
http://www.hotrodhotline.com/md/html..._vs_copper.php
http://www.cgj.com/2013/07/16/alumin...inal-thoughts/
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White '67 LeMans 407/TH350/Ford 3.89... RIP
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