I FUEL EXHAUST CARBURETION I 3 766 I CAM LEVER lPLUNGER ISCREW SPRING Carburetor Fast Idle I I I Con t I I I i 69 Blazer w Roch IBC 2BC I 70 G 20 Ser 20 30 w Roch 2BC 71 72 All Blazer vv Roch 2BC 7029428 1 SPRING throttle shaft and lever 68 72 All Blazer w Roch 4BC 7029900 1 SPRING fast idle screw i 68 72 All Blazer w Roch 4BC 7035772 1 SPRING fastidle cam lever 1 72 All Blazer w Roch 4BC 7003176 1 SPRING carb fast idler stop I 3 767 SCREW Carburetor Fast Idle Cam I I I 54 72 All Blazer gw Roch Carb 7 003561 1 I attaching No 12 28 x 3 786 VENTURI Carburetor I I 71 72 Ser 10 G 10 Blazer Roch 2BC w A T I I I I 72 Ser 20 Conv 4 WD Sub I Roch 2B C w A T 7042627 1 3 790 GASKET SCREW Venturi Cluster I 55 69 All vv 2BC I 69 Blazer w Roch 2BC I 71 72 Ser I10 Blazer G 10 w Roch I 2BC exc D D V 72 Ser 20 Conv 4 WD 307 7000293 2 SCREW venturi at outer holes 69 All w Roch 2BC I I SCREW fuel outlet center w 7026113 I 7029122 23 24 70 G 10 Ser 10 Roch 2BC Q I Iw A T 307 I I l 71 Ser 20 30 w Roch 2BC I 72 Ser 20 Conv 4 WD Cab 3071 I I 72 Ser 20 30 D DI 307 72 Ser 30 Conv 307 I 7009077 1 fuel venturi center w 7040123 24 7023 24 I 69 All w Roch 2BC Q SCREW fuel outlet Otf w 7026113 7027122 23 24 V 70 G 10 Ser 10 Roch 2BC I r I V w A T 307 A I I 71 Ser 20 30 w Roch 2BC 7008502 2 fuel venturi outer w 704O123I 24 7023 V 24 3 72 Ser 20 Cab w Roch 2BC I V 72 Ser 20 30 D D w Roch 2BC 72 Ser 30 Cnv w Roch 2BC 7045762 2 SCREW fuel venturi outer holes 3 792 JET Carburetor Metering Rod I I I NOTE Stamp on top or side denotes orifice diameter in thousands 38 49 Comm I w 7002539 40 4600 50 51 Comm 216 A w 7004039 53 Comm 216 I 1 step lean 60 degree approach i w 7004600 I I 70 G 10 Ser 10 w Roch 2BC I 307 exc A T I I 70 Blazer w Roch 2BC 307 exc A T I 71 G 10 w Roch 2BC exc A T 7002651 1 main 60 degree approach w 7040105 I I I I 0405 7007 38 53 Comm Util main standard w 7002540 4600 5060 I 60 Ser 10 thru 30 8 cyl exc I 4BC main w 7015015 68 69 G 10 20 Ser 10 thru 30 l I I w Roch 2BC 307 69 Blazer w Roch 2BC I I 60 degreefapproach 70 G 20 Ser 20 3 0 w Roch 2BC 307 7002652 A Fl I main 60 degree approach w 7040108 7028 38 53 Comm 216 1 step rich w 7002540 4600 I 67 Ser 10 thru 30 G 10 20 w Roch 2BC main metering w 7027100 5 6 7037100 V 5 68 Ser 20 Sub 307 I w 7028105 11 25 68 G 10 20 Ser 10 307 I 7002653 I 2 w 7028100 05 11 25 60 degree approach 38 51 Comm w 7002540 46OO I 52 Comm V 2 step rich vv 7002540 4600 63 65 Ser 10 thru 30 283 exc V 4 WD D D A GM PAFlT S DIVISION GENERAL MOTORS CORPORATION CHEVROLET 72TL I 3 766 3 792 I a 106 V I I I I REV 5 79 I I