Bruce A. Frank wrote:

I have found that the radiator manufacturers are very helpful and do not shy
away from the aviation application topic. If you have a ballpark on the
horsepower developed they can provide an applicable unit in just about any
shape or dimension you need to fit in the space you have available. One of
the companies with which we Ford builders have worked is Griffin Racing
Radiator at <http://griffinrad.com/>. There are several others in the racing
arena but I don't have their addresses in front of me.

Bruce A. Frank

According to Jeff they are not fourth coming with the engineering 
information necessary to design low drag ducting.
 
Paul Lamar
 
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