Quadrajet dating

If there is an E before the number 4, that designates an electronically-controlled carburetor. Carburetors built before mid, have a tag with the part number.

Help Finding 69 Quadrajet Date Code and Distributor date code. | rganerigsteeptoa.gq

In late , the seven-digit part number was stamped vertically into the main housing. All Rochester Quadrajet carburetors are identified by a seven- or eight-digit GM part number. On units made before mid, the part number was stamped around the outside edge of a round metal tag attached to the fuel bowl. But, not all Quadrajet carburetors were built by Rochester. Carter Carburetors was also contracted to build the Quadrajet carburetor for GM cars from into the lates.

Any and all replacement parts between Carter and Rochester are directly interchangeable. After that, you will find either a 2, or a 5. The number 5 designates an emission carburetor from California. The digit following the number 2 or 5 , will indicate the type of GM car it was originally installed. A 4 would mean it is for a Buick, a 5 would mean Oldsmobile, and Pontiac carburetors usually have a 6 or 7.

Chevrolet Quadrajet carburetors would have a 0, 1, or even a 2.

Help Finding 69 Quadrajet Date Code and Distributor date code.

The last two remaining digits determine whether the carburetor came from a car equipped with an automatic or manual transmission. Usually an even number will indicate an automatic car, while odd numbers indicate a manual transmission. Carburetors installed on Cadillacs, however, do not follow this rule of thumb. Quadrajet carburetors built after , use an eight-digit casting number. These carburetors do not follow the identification numbers of previous years; they will start with either or The last three digits will unfortunately, give you no information about the carburetor, unless you have a Rochester numerical reference chart.

The carburetor on the left has the bulge arrow , and is an cfm unit. The one on the right does not have the bulge, which makes it a cfm unit. The primary wall of the cfm unit does not have this bulge, and is consistent throughout. These Quadrajets are difficult to modify for conventional use. From through , the M4MC was used in GM four-barrel applications, and utilized the standard carburetor-mounted choke and dual choke pull-offs.


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An easy way to determine of you have this E4ME Quadrajet, is the fuel inlet faces straight into the front of the carburetor — instead of connecting at a degree angle — and there will be an electronic connection capability. This code can be deciphered as such: All Quadrajet fuel inlets are in one of two positions.

One thing to keep in mind, when trying to date a carburetor, is that the year of production might not always be the same year as indicated by the number on the carburetor.

This was most common in the and models, as Rochester was not able to keep up with production. Finding a compatible donor carburetor for your application should be relatively simple. There are a countless numbers of Quadrajet carburetors still being used, or just waiting for you to rescue them from the local salvage yard. Since this actually occurs when the carburetor is not properly tuned, it is an ill-conceived, derogatory name. There were many models of Quadrajets used throughout the years, which tells of the versatility. The first few versions to appear were coded 4MC, which utilized a side-mounted integral choke, and the 4MV that made use of a manifold-mounted choke.

Benefits Of A Quadrajet.

Quadrajet dating

Since the Quadrajet has different-sized primary and secondary venturi, the small primaries make the carburetor more efficient than even a large two-barrel, or square-bore four-barrel. The smaller primaries act as a small two-barrel carburetor until the accelerator is pressed far enough to open the secondaries. If there is an E before the number 4, that designates an electronically-controlled carburetor.

Carburetors built before mid, have a tag with the part number. In late , the seven-digit part number was stamped vertically into the main housing. All Rochester Quadrajet carburetors are identified by a seven- or eight-digit GM part number.

(Pic) Quadrajet Date code?

On units made before mid, the part number was stamped around the outside edge of a round metal tag attached to the fuel bowl. But, not all Quadrajet carburetors were built by Rochester. Carter Carburetors was also contracted to build the Quadrajet carburetor for GM cars from into the lates. Any and all replacement parts between Carter and Rochester are directly interchangeable.

After that, you will find either a 2, or a 5. The number 5 designates an emission carburetor from California. The digit following the number 2 or 5 , will indicate the type of GM car it was originally installed. A 4 would mean it is for a Buick, a 5 would mean Oldsmobile, and Pontiac carburetors usually have a 6 or 7.

follow site Chevrolet Quadrajet carburetors would have a 0, 1, or even a 2. The last two remaining digits determine whether the carburetor came from a car equipped with an automatic or manual transmission. Usually an even number will indicate an automatic car, while odd numbers indicate a manual transmission.

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Carburetors installed on Cadillacs, however, do not follow this rule of thumb. Quadrajet carburetors built after , use an eight-digit casting number. These carburetors do not follow the identification numbers of previous years; they will start with either or The last three digits will unfortunately, give you no information about the carburetor, unless you have a Rochester numerical reference chart.

The carburetor on the left has the bulge arrow , and is an cfm unit.

Rochester Quadrajet Idle Tube Removal

The one on the right does not have the bulge, which makes it a cfm unit. The primary wall of the cfm unit does not have this bulge, and is consistent throughout.


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  • These Quadrajets are difficult to modify for conventional use. From through , the M4MC was used in GM four-barrel applications, and utilized the standard carburetor-mounted choke and dual choke pull-offs. An easy way to determine of you have this E4ME Quadrajet, is the fuel inlet faces straight into the front of the carburetor — instead of connecting at a degree angle — and there will be an electronic connection capability.