Copper does absorb heat better than aluminum. The advantage of the aluminum radiator is in the tubes. Copper/brass radiators use smaller tubes like around a 1/2 -3/4 inch where an aluminum radiators uses wider tubes that are 1 to 1 1/2 inches wide which provides a larger cooling area. The radiator in the Chevelle has 1 1/2 tubes and seems to work fairly well even with the cheap electric fan.
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