It's the engine number.
1G = 3-3/16 bore 95hp V8 engine coupled to a 4 speed lorry gearbox.The 1 means a 1940 model/production year (which does not correspond to a calendar year).
10581 = sequential number of the engine (not the truck). 1G7F was produced in Feb 1940, 1G15318F in November 1941.
F: Foreign to Canadian or US domestic production, which in effect means they are used in right hand drive vehicles.
Mike
Last edited by Mike Cecil; 19-02-18 at 05:26.
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