Engine Data Plates

[m-11]

Stupid question, do all engines have data plates? I'm asking because of the three trucks I own, the 51 has a data plate that shows it was rebuilt but the 53 & 54 don't have any plates. So do I assume that these engines never had data plates unless they were rebuilt?

[Carter]

Correct, plates were added by the military to indicate what was done, Cyl. bored? crankshaft mains and rod journels turned? also who did the work and when.

[m-11]

Thanks Carter, I thought this was the case because my 51 has 40k whereas the 53 19k and the 54 has 14k.