160B, This is what I am thinking...has anyone ever seen an OEM 30-31 radiator with the vertical outdentations stopping before they reach the top like that? Was it a 1970's pop off of some kind?
On a original radiator the side frame is not flat, it has a curved indentation. If the side frame is flat it is a reproduction. I do not have a good photo of the side frames. Here are some more photos of an original tank and the dimpled fins.
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Resized P1010325 backside of original tank.jpg
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Resized P1010327 front side of spare original tank.jpg
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Resized P1010328 back side of spare original tank.jpg