"Not to beat a dead horse, but this is news to me. So on my 55 first series, as long as the engine is a 55 first series, it could be the original engine to the truck? (This is a hypothetical question). "Of course, as long as your truck is a 1954 or a 1955-1st series and the two codes match the codes for a 1954 or a 1955-1st truck.
"On 54 and 55 first series the VIN tag only has the one number."Presumably, you are referring to the Vehicle Serial Number (either code might have been used as a registration/title "VIN")?
The Vehicle Serial Number code is a different code from the Engine Serial Number code. However, both codes are unique for a
1955-1st series truck or a
1954 truck; and, the codes for each year should therefore be "matching numbers" at least for the year-series.
