Nice article in the current edition of N-news. Thanks Chris. Would like to share how confusing the age of the NAA and hundred series Fords can be!! My recent event of getting two NAA,s left me with one having no SN to be found. I"ll let you guys figure out what year (years) my NAA is. Will give you a couple of clues. The engine has an oil filter that fastens directly to the block. (no adaptor)Was going to give another clue but that would take all of the fun out of it. Well11 it has to ,do with the numbers found on the lift chest, trumpet housing and transmission. That should make it easy.