FUEL EXHAUST CARBURETION C257 CHEVROLET 1980 ROCHESTER ZBC Continued See Model Reference for Application GROUP DESCRIPTION OTV 31 32 33 34 35 3 741 SCREW throttle body 44 AR 3 454 SCREW throttle lever to body 1 3 444 SCREW throttle stop 1 V 3 755 SCREW vac brk attach 1 7 3 755 SCREW vac brk attach bottom 1 3 755 SCREW vac brk attach top 1 3 730 SCREW vent stack attach 1 3 820 SCREW vent valve cover I v 3 790 SCREW venturi cluster bracket center 1 3 790 SCREW venturi cluster outer AR 3 752 SCREW wire clamp 4 1 3 752 SEAL choke hsg to bowl 1 3 752 SEAL inter choke shaft dust 1 7037569 7037569 7037569 7037569 7037569 3 858 SEAL solenoid to float bowl 1 3 764 SENSOR throttle position 1 3 752 SHAFT ASM choke 1 7041234 7041234 7041234 7041234 7041234 3 752 SHAFT ASM inter choke 1 3 750 SHAFT 81 LEVER choke I 3 752 SHAFT LEVER ASM inter choke 1 17063458 17063458 17063458 17063458 17063458 3 842 SHAFT LEVER pump 1 3 440 SOLENOID UNIT w brkt 1 17061822 17061769 17061769 17061769 3 440 SOLENOID idle stop 1 3 440 SOLENOID mixture control 1 3 766 SPRING cam lever 1 17051494 17051494 17051494 17051494 17051494 3 753 SPRING choke valve 1 3 766 SPRING fast idle screw 1 7029900 7029900 7029900 7029900 7029900 3 470 SPRING fuel filter 1 7032732 7032732 7032732 7032732 7032732 3 870 SPRING governor 1 3 823 SPRING idle needle AR 3 766 SPRING idle stop screw 1 7003176 7003176 7003176 7003176 7003176 3 810 SPRING metering rod prim 1 7041459 7041459 7041459 7041459 7041459 3 859 SPRING pwr piston 1 7036019 7036019 7037305 7037305 3 825 SPRING pump discharge 1 3 841 SPRING pump return 1 7042979 7042979 7042979 7042979 7042979 3 764 SPRING sensor adjustment 1 3 858 SPRING solenoid screw 1 3 858 SPRING solenoid rtn I 3 766 SPRING throttle stop screw 1 3 750 STAT COVER 81 COIL elect 1 17064702 17064215 17063451 3 750 STAT COVER COIL GASKET 1 17064473 17064473 3 761 STOP UNIT carb throttle 1 3 755 VACUUM BREAK BRACKET choke side aux 1 17063958 3 755 VACUUM BREAK 81 BRACKET rear aux 1 7 3 755 VACUUM BREAK BRACKET Main throttle side 1 3 755 VACUUM BRK 81 BRKT primary 1 3 755 VACUUM BRK 81 BRKT secondary 1 3 755 VACUUM BREAK CONTROL BRACKET choke side 1 17060808 17063485 17063485 17063485 17063485 3 751 VALVE choke 1 7048904 7048904 7048904 7048904 7048904 3 820 VALVE idle air bleed 1 V 3 730 VENT STACK 1 3 786 VENTURI CLUSTER 1 3 823 WASHER idle needle spring 1 A 3 832 WASHER pump lever 1 3 444 WASHER tab locking 1 WAREHOUSlNG AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPORATION CHEVROLET 107 3 000 GROUP 3 208 C REV 5 81