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1955 1956 Packard Dual Four Barrel carburetor installation sheets dated 2/15/1957. They measure 8 X 11 inches, with 8 pages total full of information! These "reprint" Rochester carburetor service installation sheets are specific for just the Packard for these two years covering the Standard and Caribbean. They show illustrated parts break down and all the original part numbers for the carbs and parts. They discuss and show illustrations for adjustments of float level drop, Idle vent adjustments, choke adjustment, pump rod, fast idle, underloader, secondary and secondary lockout adjustments.They also have quick referance specifications and are full of detailed information for anyone who needs to maintain or set up this Dual Quad system. Very informative and a "must have" to service and maintain these Dual quad units.