Hy RWL, are you sure your serial number is correct as you posted it? 31311 is a 1953 1/2 ton flat face cowl year/model number. A flat face cowl has the normal front end sheet metal, and a firewall, but that's it for the body, the customer supplies the rest. As to your engine number, I couldn't find my casting number list this morning, so I checked at Inliners International, and that casting number doesn't show up there, it probably is the original engine, the stock engine in a Canadian 53 1/2 ton is a 235, hope that helps.
