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Does anyone know the difference between the two ratings, per WWII era, late '40s? An article in the CCCA quarterly some years ago about the Cadillac 346-ci V-8s used (a pair in each) in the M-5, M-24 light tanks, M-19 anti-aircraft gun carriage mentioned their 115 hp military rating against their advertised automotive 150 at the same 3,400 rpm.

Packard's marine version of the 356 was rated 150hp against the advertised 165. Military/marine, apple and apple, or apple and orange? Only interested in how these ratings were determined during the '40s, not today.