55 59 Ser 4 6 8 cyl exc distr cont gov 1 step lean 56 Ser 7 8 standard square approach 58 59 Ser 5 exc 4BC 59 Ser 7 8 w 2BC 348 7002952 2 91 square approach stamped 52 w 7012457 3013 3353 56 Ser 5 6 w gov exc P T 56 Ser 7 8 7002951 2 91 1 step lean square approach stamped 51 56 59 All 322 7002656 2 91 standard 60 approach stamped 56 57 59 Ser 5 6 7 8 w 4BC 61 Ser 60 w 4BC 8 cyl exc Tilt 7002648A R 91 primary and secondary w 7009661 701 1 161 1487 2303 3021 3023 57 Ser 9 10 w 4BC 7008678 2 91 secondary stamped 78 58 59 Ser 5 6 7 8 w 4BC primary w 701 1487 2303 3021 3023 61 Ser 60 w 4BC 283 exc SBC Tilt 7002647 2 91 secondary w 7013023 59 Ser 9 10 exc 10F 60 61 TDM 60 61 Ser 80 63 Ser 50 60 292 7008670 2 91 main secondary w 7013025 5025 7020025 3013 60 62 Ser 50 8 cyl exc 4BC 60 62 Ser 40 63 65 Ser 80 348 main secondary stamped 60 w 7015015 5011 62 65 Ser 80 348 65 Ser 60 348 7008669 2 91 main secondary 60 approach w 7020025 63 Ser 50 60 292 7008673 1 91 main 60n approach w 7023013 64 66 Ser 50 60 292 main w 7024009 67 Ser 40 thru 60 292 exc A R 7008672 1 91 w 7027009 65 Ser 60 348 7020025 68 Ser 40 Tilt 307 7002655 1 91 w 7028106 07 27 66 67 All w 2BC 366 69 Ser 50 60 Roch 2BC w L P Gas 366 7008668 1 91 main primary 60 approach w 7026113 66 Ser 50 w gov exc D D A I R main meter 60n approach stamped 63 w 7026029 67 Ser 40 w gov 250 7008663 1 91 w 7027029 67 All w 4BC 366 69 Ser 50 366 exc A I R L P Gas 69 Ser 60 366 exc A I R Tilt L P Gas 69 Ser 60 Tilt 366 exc L P Gas 2292685 2 25 main primary w 3908474 3929604 3935215 3943175 67 68 All w Holley 4BC 69 Ser 60 w Holley 4BC 427 2339559 2 24 secondary 68 All w Holley 4BC main primary 69 Ser 50 w A l R 366 exc L P Gas 69 Ser 60 w A l R 366 exc Tilt L P Gas w 3943175 69 Ser 60 427 2370787 1 25 w 3924592 3943176 68 Ser 40 250 7034209 1 96 main 45n approach w 7028011 68 70 All 292 7034228 1 91 main 45 approach w 7028013 9012 7040012 7012 69 70 Ser 40 w Roch 1BC 250 7034206 1 97 main primary 45n approach w 7029011 7040011 701 1 69 70 Ser 50 w Roch 2BC 250 7008667 2 91 w 7029124 7040124 7024 69 70 Ser 40 w Roch 2BC 7008666 2 91 main 60 degree approach 69 Ser 50 w A I R 366 exc L P Gas 69 Ser 60 w A R 366 exc L P Gas Tilt 70 All w Holley 4BC 2370788 2 75 carb main mtr 70 Ser 50 60 w Holley 4BC 366 2285783 1 25 main Holley 22R 40 62 w 3943175 70 Ser 60 w Holley 4BC 427 2334344 2 24 secondary w 3943176 NOTE Stamp on top or side denotes orifice diameter in thousands 1971 CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION P A 31S 3 792 3 792 3 100 REV 6 7 I