Carburetor Identification

Rochester carburetor number is stamped on upper part of brass tag attached to carburetor. A letter ("A", "B", etc.) stamped in box in lower left corner of tag indicates successive engineering changes or modifications made in production (each succeeding letter indicates that all previous modifications also included). Notation in second box on tag("A5", "B5", etc.) designates month and year that carburetor was manufactured (A - January, B - February etc. and 5 - 1965) and can also be used to identify modifications. Marks in following two boxes are inspection markings and have no service significance.