I put an aluminum radiator in my 1957 Fairlane, and it worked well. However, the shiny aluminum just looked weird. In retrospect, I wouldn’t have done it.
If you you decide to paint an aluminum radiator black, be aware that you need to use (usually expensive) radiator paint, probably around $20 for a spray can. The conventional Rustoleum (or similar brands) from Walmart will very likely cause poor heat transfer performance because those paints go on much too thick.
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