Packard engine numbers were stamped on a white-painted boss on the upper left-hand side of the cylinder block. A vehicle number was also stamped on a plate attached to the left top side of the cowl and was the same as a Body/Style Number, since it identified the model or style. A Body Number was provided and was also stamped on the plate attached to the left side of the cowl below the hood. The Body/Style Number appeared as the first four digits of the Packard serial number, followed by a sequential production number for that body style staring at 2001. Engine numbers for the Clipper Six were F-15001 to F-50999. Engine numbers for Clipper and Clipper Deluxe Eights were F-320001 to F-399999. Engine numbers for Super Clipper and Custom Clipper Eights ranged from F-506001 to F-521999 with both built in mixed production and sharing the same range of numbers.

Packard engine numbers were stamped on a white-painted boss on the upper left-hand side of the cylinder block. A vehicle number was also stamped on a plate attached to the left top side of the cowl and was the same as a Body/Style Number. A Body Number was provided and was also stamped on the plate attached to the left top side of the cowl, below the hood. The Body Number does not provide model identification, but represents a production sequence record used mainly for factory purposes. The Body/Style Number appeared as the first four digits of the Packard serial number, followed by a sequential production number for that body style staring at 2001. Engine numbers for the Clipper Six were F-1501 to F-14999. Engine numbers for Clipper and Clipper Deluxe Eights were F-300001 to F- 319999. Engine numbers for Super Clipper and Custom Clipper Eights ranged from F-500001 to F-505999 with both built in mixed production and sharing the same range of numbers.