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.