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1955 1956 Pontiac Dual Four Barrel carburetor installation sheets dated 11/1/1955, 2/15/1956, 2/15/1957. They measure 8 X 11 inches, with 6 pages total full of information! These "reprint" Rochester carburetor service installation sheets are specific for just the Pontiac for these two years, and show illustrated parts breakdown 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.