When/if you paint the radiator, use lacquer paint on the core fins instead of enamel. I had two numbers matching radiators re-cored a while back and the old guy told me 5 times if he told me once, to not use enamel paint on the fins because it is too thick and will cut down the flow. He's been in the radiator business for 50 years, so I'm gonna take him at his word....lol.