Yes if its a 40 model the suffix codes didn't start being used until serial number 18159 and higher. Never sure that was the first gasoline tractor sold though. IH did send a gasoline to test at Nebraska in 1939. Going by the tractor serial number tested it was probably a preproduction tractor.
Serial 15327 was built in May of 1940 and the suffix codes started on ones built in June of 1940.
There is a chance it came as a gasoline, although slight. Can't say it didn't come gasoline for sure though.
Only way I can think of at the moment to get a idea, is to see if a date code and casting number can be found on the cylinder head. If its a gasoline casting with a date code date before May 1940 it would a good indicator it came without the starting tank.
Did think of something else. Probably can get a idea if the head was changed before going to the trouble of looking for the casting number. If it has 7/16 diameter studs and nuts mounting the manifold to head instead of 3/8 it has a newer head.
Also the engine serial number is probably the same as the clutch housing serial number on that serial number range.
This post was edited by D Slater at 04:28:56 05/06/14.
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