I stumbled across this today and though it may be helpful to someone on the list.

As I recall the biggest evaporator suitable for our purposes was from the Chevrolet Caprice, Cadillac CDV, or similar vehicle.  Those didn't appear big enough for my 20B application, unless I wanted to use three.  So, I went with a single conventional cross-flow radiator, mounted under the engine/psru.

I was browsing the net today and ran across a much larger evaporator that I thought someone might find useful.  I don't have the dimensions, but it appears to have 23 tubes.  It fits a late 90's Dodge full-size van.  Price quoted was $156.  Possibly two of these would be sufficient for a 20B application.  Attached is a picture.


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