Thanks for the tip. They are likely pretty old. I don't know the history of the pumps and neither did they guy I bought them from, he got them as part of a bulk purchase. They are all likely quite old. One of the chevy pumps has a date code from the late 30's and one from the 40's. The others have no code or part numbers. The only notable marking is "Made in the USA" On all of them.
