My apologies on the confusion...that's what I get for trying to post while the kids are fighting in the next room. If memory serves, Chrysler Corporattion was big on inline engines until the early hemi V-8 engines of the 50's. I would imagine you Grandfather was originally issued a M4A1 or M4A2 and the M4A4, when running well, would probably be significantly more powerful in real world use than the radial or twin diesels.
He was a lucky man to get the Firefly!
Thanks-
Dave
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