The thermal conductivity of Copper is nearly twice that of aluminum meaning a better material to use. I agree with you that the Aluminum Pantera radiator was someone's idea of saving weight. I know the big auto manufacturers went to it to do that as well as cost. That's why the Hall Copper rad is $1700, the Brassworks is $1900, and a nice GT40 copper rad is $2500. Some of the aluminum rads are also epoxied, not welded.
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