Rebuilt Carburetors

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Rochester Carburetor Articles

Selecting The Best Quadrajet Core

The best quadrajet core, if possible, is the one you already have. Finding another core candidate isn't that hard, but you never know for sure what kind of problems you are getting.

Quadrajets produced in 1976 and later are your best core candidate. These have gone through most of the modifications and engineering updates. Of course you want to look for one that has the fuel feed inlet on the same side as yours. Either the front, or side. The linkage is another consideration, but the later model quadrajets are usually very accommodating.

Quadrejets that came from a mass re builder may not be the best candidate. These were often modified to fit more than one application.

Casting numbers starting with 1705 were produced from 1976-1979.

Rochester Quadrajet Identification

Up until 1968 quadrajets had a metal tag stamped into the body of the carburetor located on the driver's side. The metal tag contained the carburetor number. From 1968 the carburetor number was stamped onto the main casting above the secondary linkage.

Quadrajets thru 1969 used carburetors numbers starting with 702.....

Quadrajets 1970-1974 used numbers starting with 704.....

Quadrajets 1975-1979 used numbers starting with 1705....

Starting in 1980 quadrajet carburetors used number starting with 1708....

 

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FAQS

The basic casting series of the Quadrajet carburetor is 4M. All variations of the Quadrajet revolve from this series.
In 1965 the Chevrolet division was the 1st to use the Quadrajet on some engines. 705200, 705201, 7025220, 7025221
In 1966 Oldsmobile added the Quadrajet to some of it's V8's.
In 1967 Cadillac and Pontiac added the Quadrajet to it's line.
In 1968 the Quadrajet carburetor became the standard 4 bbl carburetor for all of GM's divisions.
Carter also produced many Quadrajets under license from Rochester.
There were several problems with the early Quadrajets, but we know about these and make the modifications when we do a rebuild.
In 1971 the Pontiac division modified the Quadrajet casting using numbers: 7041267, 7041268, 7041270, 7041273 on 455 HO, and 7041263 used on the 400 and 455 with manual transmissions. This was for 1971 only.
Buick used a modified Quadrajet from 1971-1974. These carburetors used the divorced style of choke.
Pontiac used the Buick modified Quadrajet for it's 455 from 1973-1974. These are great high performance carbs.
The 4M casting was redesigned in 1975 and became the M4M series.

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