That is my point, it may be rare, but possible. As for title identification, Pennsylvania did not use engine numbers for titles so again, I just suggesting that we really need the actual full casting dates to delve into this conundrum.
Not trying to be argumentative here, as anything is possible, but I still think it would be highly unlikely that an engine headed for the assembly plant wouldn't have a code stamped on it. The engine got it's code stamped on during the machining process, then it went down the line and the flywheel and clutch were installed (is it the HD or standard clutch?), then the head and sheet metal were bolted on. After that it went to paint...is it blue for a car or gray for a truck? Without the engine code how would the assembly plant know if it was built with a HD clutch for a 3100 truck or a 3800?
PA may not have used the engine serial number for titling purposes, but many States did prior to 1955. Chevrolet stopped adding engine serial numbers after the 1956 model year.
Yes, casting date codes would help...
Mike B
