Radiator: Aluminum vs. Copper? (time-critical)

[luvrbus]

I bought a couple of air to air chargers from CG&J had a few problems but they made it right I wonder if they use the same material for radiators as they do for their chargers
My reason for asking I saw air to air chargers made before they have these blanks they cut the size and weld the end pieces with the fittings pretty much was all there was to that not like they were installing each tube and fins 


good luck