To break the codes, you gotta know where to look. You'll find 'em on the driver side of the carb, on a vertical pad in the area of the secondaries. Early carbs used a circular metal disc stamped with the codes and attached to the same side, but further forward on the float bowl. Rochester-built carbs are denoted by the words "Rochester Quadrajet" cast into the driver side of the carb body.To break the codes, you gotta know where to look. You'll find 'em on the driver side of th From 1967 through 1972, the venerable Quadrajet carburetor was used on many Chevelles ordered with standard performance engines, and those applications will be the focus of this article. Quadrajets were manufactured by Rochester (a division of General Motors) and Carter carburetors. Outsourcing carburetor production allowed delivery to meet demand as the Q-jet was used on other Chevrolet models and virtually every other GM nameplate as well. With so many carbs in production for a myriad of applications, finding the right one for your Chevelle can be a challenge. There are a couple of locations containing the codes needed to identify your Quadrajet; both are located on the driver side of the carb body. Early Q-jets used a circular tag stamped with the codes found in a cavity in the side of the float bowl, while later carburetors used a stamping on the body of the carb. Breaking down the carb codes is fairly simple once you have some basic idea of how the system is setup. Information included in the stamped alpha-numeric codes are the model/application number (usually seven digits), and a date code. All Carter-built Q-jets have "Mfd by Carter" cast into the carb body, although the carb numbers (application codes) are the same as Rochester-built carbs. This is what the stamping will look like on a Rochester-built carb. This particular model came off a '70 Chevelle with an LS5 454/360-horse and a four-speed trans, non-CA emissions.This is what the stamping will look like on a Rochester-built carb. This particular model Carter-built carbs have their stampings in the same area, but differ slightly in configuration, even though the application codes are the same as Rochester-built carbs. This one came off a '71 Chevelle with a 270-horse 350 small-block backed by an automatic transmission.Carter-built carbs have their stampings in the same area, but differ slightly in configura The Carter-built carbs are also easily identified by the "MFD by Carter carburetor for GMC" cast in the same area on the driver side of the carb body. Carbs built by Carter also use the same rods, jets, hangers, etc. as the Rochester-built Q-jets.The Carter-built carbs are also easily identified by the "MFD by Carter carburetor for GMC Outin' The Code The stamped part number decodes as follows: Example: #70 4 0 2 0 5 EH 0260 70 = Prefix code. "70" will appear on all Q-jets through 1976 4 = Decade produced (ie: 2=1960's; 3=1960's with A.I.R.; 4=1970-1975) 0 - Year produced. 0=1970 2 = Model (ie: 2=Quadrajet (4 bbl) Federal standards; 5=Quadrajet (4 bbl) California standards) 1 - Division. 0, 1, and 2 all indicate Chevrolet. 9 - Transmission (ie: Even numbers=Automatic Trans; Odd numbers=Manual Trans) DG - Customer code (assigned for each application, matches carb code on build sheet) 0260 - Julian Date Code (026=26th day of the year; 0=year of production, 1970) WATCH YOUR CARBS Rochester Carburetors (Listed in numerical sequence) P/N Carb Model Year Eng HP Trans Notes 7027200 4MV 1967 396 325 AT early 7027201 4MV 1967 396 325 ST early 7027202 4MV 1967 327 275 AT 1st type 7027203 4MV 1967 327 275 ST 1st type 7027210 4MV 1967 396 325 AT late 7027211 4MV 1967 396 325 ST late 7027212 4MV 1967 327 275 AT 2nd type 7027213 4MV 1967 327 275 ST 2nd type 7027216 4MV 1967 396 325 AT 3rd type 7027218 4MV 1967 327 275 AT 3nd type 7028210 4MV 1968 396 325 AT 7028211 4MV 1968 396 325 ST 7028212 4MV 1968 327 275 AT 7028213 4MV 1968 327 275 ST 7028217 4MV 1968 396 350 ST 7028218 4MV 1968 a396 350 AT 7028229 4MV 1968 327 325 ST 7029200 4MV 1969 396 325 AT 7029201 4MV 1969 396 325 ST 7029202 4MV 1969 350 255 AT 7029202 4MV 1969 350 300 AT 7029203 4MV 1969 350 255 ST 7029203 4MV 1969 350 300 ST 7029204 4MV 1969 396 350 AT 7029215 4MV 1969 396 350 ST 7036200 4MV 1966 396 325 AT A.I.R. 7036201 4MV 1966 396 325 ST A.I.R. 7036202 4MV 1966 327 275 AT A.I.R. 7036203 4MV 1966 327 275 ST A.I.R. 7036210 4MV 1966 327 275 AT A.I.R. 7037200 4MV 1967 396 325 AT A.I.R. 7037201 4MV 1967 396 325 ST A.I.R. 7037202 4MV 1967 327 275 AT 1st type A.I.R. 7037203 4MV 1967 327 275 ST 1st type A.I.R. 7037210 4MV 1967 396 325 AT late A.I.R. 7037211 4MV 1967 396 325 ST late A.I.R. 7037212 4MV 1967 327 275 ST 2nd type A.I.R. 7037213 4MV 1967 327 275 ST 2nd type A.I.R. 7037216 4MV 1967 396 325 AT 3rd type A.I.R. 7037218 4MV 1967 327 275 ST 3rd type A.I.R. 7040200 4MV 1970 402 330 AT 7040200 4MV 1970 454 360 AT 7040201 4MV 1970 402 330 ST 7040201 4MV 1970 454 360 ST 7040202 4MV 1970 350 300 AT 7040203 4MV 1970 350 300 ST 7040204 4MV 1970 402 350 AT 7040204 4MV 1970 454 360 AT 7040205 4MV 1970 402 350 ST 7040213 4MV 1970 350 300 ST 7040500 4MV 1970 402 330 AT 7040500 4MV 1970 454 360 AT 7040501 4MV 1970 402 330 ST 7040501 4MV 1970 454 360 ST 7040502 4MV 1970 350 300 AT 7040502 4MV 1970 350 300 AT 7040503 4MV 1970 350 300 ST 7040503 4MV 1970 350 300 ST 7040504 4MV 1970 402 350 AT 7040504 4MV 1970 454 360 AT 7040505 4MV 1970 402 350 ST 7040505 4MV 1970 454 360 ST 7040513 4MV 1970 350 300 ST 7041200 4MV 1971 402 300 AT 7041200 4MV 1971 454 365 AT 7041201 4MV 1971 402 300 ST 7041201 4MV 1971 454 365 ST 7041202 4MV 1971 350 270 AT 7041203 4MV 1971 350 270 ST 7042202 4MV 1972 350 175 AT, Non-CA 7042203 4MV 1972 350 175 ST, Non-CA 7042215 4MV 1972 402 240 ST 7042220 4MV 1972 402 240 AT 7042902 4MV 1972 350 175 AT, CA 7042903 4MV 1972 350 200 ST, CA By Chuck Hansen Enjoyed this Post? 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