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While copper does transfer thermal heat better than aluminum the reason for the switch to aluminum is radiators actual cooling process happens from the core design rather than what material it is made of. Aluminum was chosen to save weight mainly and the design of all aluminum cores will out perform any copper core. You take the same exact size radiator of each and the aluminum will out perform the copper because of the core design and how it's bonded together.
In my CJ I'm using a Novak aluminum radiator and is well worth the money because of their warranty. I had a small leak develop and called them and they sent me a replacement one right away and said to use the same box and send the old one back. No questions asked all they wanted was a few pictures of the leak. Great service but was expensive.
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