I recently bought a '51 Chevy 3100. It was registered using the engine serial number which is on the title. I researched the truck serial number (5JP-E17984)located on the door post and discovered it was built during May 1951 in Kansas City, MO. I'd like to decode any information from the engine serial number which I believe is JBA636607 which is located on the passenger side of the block. I'd like to find out if the engine was the original in the truck.