Thanks for the quick responses and Keith posting of Kevin's radiator thread from 2010.
Today it's possible to get custom-fit aluminum radiator in down-flow from many reputable manufacturers. Price appears to be $500+ depending. These rads are CNC'd and TIG welded. Delivery is usually 2-3 weeks.
WRT aluminum vs copper-brass, from Griffin Radiator website FAQ:
1) Does an aluminum radiator cool better than a copper brass radiator?
An aluminum radiator does cool better than a copper brass radiator. For example, an aluminum radiator with 2 rows of 1" tubes is equivalent to a copper brass radiator with 5 rows of 1/2" tubes. Aluminum provides high efficiency, is lightweight, and has a longer life compared to copper brass.
A more detailed discussion is here:
http://www.cgj.com/2013/07/16/aluminum-vs-copper-brass-radiator-final-thoughts/ Craig
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