Quadrajet Identification Guide

The number on your Quadrajet is the starting point for finding rebuild parts and identifying its original application. Two carburetors can look similar and have different calibrations. Use the carburetor you are rebuilding as your reference, especially if the engine or carburetor has been changed.

Where to find the Quadrajet number

  1. Check the main body above the secondary throttle shaft. In our identification video, this is the stamped-number location shown for most 1968-and-later Quadrajets. Read the complete number on the carburetor body.
  2. On an early unit, look for the round identification tag. The video shows an aluminum tag carrying the number on early 1965–1967 carburetors and some 1968 units.
  3. Record all seven or eight digits. Take a clear close-up of the marking. If there are additional plant or production-date markings alongside the main number, include those in your photo and order notes rather than guessing which marks matter.

Watch the early identification-tag example or jump to the stamped-number location on later units.

Use the full number, not just the vehicle year

The original vehicle application is useful background, but it does not establish which carburetor is installed today. Our video explains that Quadrajets were calibrated for particular combinations of vehicle, engine and application. Similar appearance is not enough to select a kit or assume that two carburetors interchange.

The seven- or eight-digit code is the number to enter in our store search and on the rebuild-kit product page. If the number is incomplete or hard to read, send a photo before ordering.

Recognize the choke arrangement

The video also shows three arrangements that can help describe your carburetor when asking for help:

  • Divorced choke: the heat-operated choke coil is mounted on or in the intake manifold and connects to the carburetor by a rod.
  • Hot-air choke: the choke element is mounted on the carburetor and receives heated air.
  • Electric choke: an electrical connection heats the choke element.

Use these as supporting details, not as a substitute for the identification number. Our video notes exceptions to common fuel-inlet and application patterns.

Check the original application references

Once you have the number, use the references on our Quadrajet Information page. The Chevrolet, Oldsmobile and Pontiac PDF charts list original applications. Read the full matching entry, including engine, transmission and other comments, rather than relying on part of the number.

What to send us if you need help

  • A close-up of the complete identification marking or early tag.
  • Photos showing both sides of the carburetor, including the choke and fuel inlet.
  • The vehicle and engine you are using now, plus relevant modifications.

Email info@quadrajetpower.com or contact our shop. Once the number is confirmed, use our rebuild-kit buying guide to choose the level of work you plan to do.

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