GM 0HEv GM0 r1 RU0K PAITTS CATALOGUE HOLLEY 4 BARREL CARBURETORS For 1974 366 Engines with 4BC Type R 6742A For 1974 427 Engines with 4BC Type R 6743A NOTE Where is shown in the part number column refer to the variable parts listing below the part number is listed under the applicable carburetor Key Description Part No Qty Key Description Part No Qty A Service Carburetor t 4 T 59 SCREW Throttle Stop t 650550 I B Maior Repair Kit t 7027TT T 60 SPACER Throttle Connecting Rod DISC I C Minor Repair Kit t 7027TO T 61 SHAFT Throttle Primary 683358 I D Gasket Kit t 702709 T 62 PLATE Throttle Primary t 39T6082 I T COVER Secondary Throttle Diaphragm 63 FITTING Fuel Inlet t t 4 3877T42 T Housing t 393387 T I 64 GASKET Fuel Inlet Fitting 2285838 T 2 SPRING Secondary Diaphragm I 65 FILTER SCREEN 3852482 T 3 DIAPHRAGM ASSY Secondary Throttle T 66 SPRING Diaphragm Return t 2367992 T 4 HOUSING Secondary Throttle Diaphragm 393508l T 67 PUMP DIAPHRAGM ASSY 24I42T4 T 5 TUBE Vacuum Line Governor To Control 68 COVER Pump Diaphragm 6263029 I Valve 692275 T 69 ROD Air Vent Valve 3877150 T 6 SCREW Fuel Valve Seat Lock 3852465 2 70 SPRING Air Vent Valve 3852475 I 7 GASKET Fuel Valve Seat Adiusting Lock 7T VALVE Fuel Vent 3877144 T Screw 546615 2 72 SCREW 8 LOCKWASHER Fuel Pump Cover 8 NUT Fuel Valve Seat Adjusting 3852477 2 Assy 2285779 4 9 GASKET Fuel Valve Seat Adiusting Nut 5466T 2 73 SCREW Fuel Bowl To Main Body l 2367996 8 I0 SEAT ASSY Fuel Inlet Valve 690320 2 74 GASKET Fuel Bowl Screw 2367997 8 11 SEAL Fuel Valve Seat Gasket O Ring 2347976 2 75 FUEL BOWL 8 PLUGS ASSY Primary 3936298 T 12 FUEL BOWL 8 PLUGS ASSY Secondary 76 GASKET Fuel Lever Check Plug 2294772 2 Throttle 3966917 1 77 pI uC Fuel Over Cheek 3552466 2 13 GASKET Fuel Bowl l t 702707 2 78 T4 MAIN JET Secondary Throttle r 2 79 BAFFLE PLATE Right Hand 39T2I92 l 15 NEEDLE Idle Adiusting l 716518 2 80 SPRING Float I DISC 2 I6 SEAL Idle Needle 2367987 2 81 FLOAT 8 HINGE ASSEMBLY 3916087 2 T7 MAIN METERING BODY 8 PLUGS ASSY 82 BODY Carburetor Metering Primary T Secondary Throttle 702702 I 83 OA5I E r povver And Control Valve Body 2367983 I T8 GASKET Metering Body 702707 2 84 POWER VALVE ASSY Primary 3898991 T 19 BAFFLE PLATE Left Hand 3912154 T 85 ROD Choke 2386310 1 20 FLOAT AND HINGE ASSEMBLY 39T6087 2 86 SEAL Governor Body 2368023 T I 21 SPRING Float DISC 2 B7 FAST IDLE CAM 8 SHAFT ASSY 716516 1 22 RETAINER Float r l 94I4805 2 B8 GOVERNOR HOUSING 8 PLUGS ASSY 3917951 1 23 O RING SEAL Fuel Line Tube DISC 2 89 GOVERNOR LEVER ASSY 2367973 I 24 TUBE Fuel Line l 2367995 I 90 GOVERNOR DIAPHRAGM ASSY 2367971 I 25 PLATE C6I bUl BlOl Throttle Pflmafy 3916082 2 9 QQVER Ggvgrngr Diaphragm Assy 69227T T Secondary 3933863 2 92 SCREW 8 LOCKWASHER Governor 26 SCREW Pump DISCIIBTQG Nozzle 4 396039 T I Diaphragm Cover 22858T2 2 27 NOZZLE Pump Discharge 2367980 I 93 SCREW 8 LOCKWASHER Governor 28 BALI WEIGHT Pump Discharge Needle Diaphragm Cover 22858T2 2 Valve aa 3852485 1 94 5EA Oovornor Conrrol wiro 2285834 I 29 SEAL Choke Rod r 3852471 1 95 GQVERNQR BODY COVER AND BRACKET 3916098 1 30 CHOKE SHAFT ASSEMBLY 2367952 I 96 SCREW 8 LOCKWASHER Governor 3T MAIN BODY 8 PLUGS ASSEMBLY 7T6T99 T Body Cover T 32 GASKET Throttle Body 681001 T 97 WIRE Governor Cover Safety DISC 3 as RETAINER secondary Diaphragm Link 274611 I 98 NUT Choke Control Lever 426915 I 34 DIAPHRAGM LEVER ASSEMBLY 38690OT T 99 WASHER Choke Conrrol Lever ook 121841 1 35 SCREW 8 IOCKWASHER Diaphragm Lever I00 LEVER II SWIVEL ASSY Choke Control 2367974 I Asav 8 Driver Asav rr r r DISC I TOT NUT Governor Lever 120614 I 36 THROTTLE BODY 8 SHAFT ASSY 7T65T4 T tg LOCK WA55 ER Governor Lever Nut 120217 1 37 SCREW Pump Operating Lever Miuating 39I 079 I T03 SPRING Governor 2285724 I 38 LEVER Pump Operating i r ai 8217723 I TO4 RETAINER Governor Diaphragm Link DISC I 39 RETAINER Choke Rod 8 Pump Operating TO5 SCREW 8 LOCKWASHER Governor Lever L 943T762 I Housing ASSy 2368036 3 40 SOLENOID 7I2875 I I06 PIN Fast tele 3958063 I 4T NUT Seienaid Attaching I4 398 228 I I07 scREw Fast Idle Adiusting 3933862 I 42 SPRING Pump Operating Adluating Screw 3888872 I Ioa NEEDLE Idle Adjusting 5T65T8 2 43 SCREW 8 IOCKWASHER Thrattia 8 Iv DISC I IO9 SEAL Idle Adiusting Needle 2367987 2 44 FITTING OR NUT Pump Operating Lever 39I77I0 I II0 GASKET Flange 696287 1 45 SHAFT Carburetor Thrpttla Se nr Iarv TTT MAIN JET Primary Throttle 7I65T7 2 Inc Lever 39l6085 l I BRACKET ASSY Solenoid Assembly 7T2874 I 46 SCREW Carburetor Throttle Plate 39 lg2lg g g parts Nm Ustrar d 47 PLATE Carburetor Throttle Secondary 393 86 48 DusnINo Carburetor Throttle Shaft 2368016 6 VARIABLE PARTS LISTING 49 ROD Connecting Carburetor Throttle 2368020 I carburewrs 50 HOUSING ASSY Throttle Operating Shaft 7T6567 T 5T LEVER Catch 716851 1 Key R 6742A R 6743A 52 KIT Redundant Throttle Closing 7T7662 T ss scREw Throttle Lever Housing 2368OOT 2 A Ziggy gig 54 BUSHING Throttle Shaft 716847 I 2 38966 5 3889777 55 SPRING Redundant Throttle Closing 716197 1 3 70270 7027 2 56 LEVER Trip 7T6848 T I4 72 00 72 40 57 CAM Carburetor Accelerator Pump 3852480 T 82 7 65 9 DISC 58 SPRING Throttle Stop Screw 2285846 T 96 NOTE Parts found on illustration but not on variable parts list are not applicable to the sublect carburetors or are not serviced GROUP 3 725 HOLLEY CARBURETOR CHART 13