Fed-X said my old one out of my 53 panel said it weighed 19 lbs. So sounds like everything is pretty much pound for pound!
There is a very interesting post here just this past week about radiators..... U.S.Radiators in fact and who they supply and one of the guys from U.S. Radiators made a very interesting post. It was a post initially made by Denny G.
Mine came from Carters a year ago for $295.
Chevman32, how long has it been since you ordered yours from NAPA. Do you have that part # handy? I know a friend here locally who is looking for one and don't want to pay the local rad shop 500 bucks to fix the old one.