Often asked: What 4 Barrel Carburetor Did Gm Use?

What carburetors did GM use?

What’s more, the Quadrajet carburetor was employed by every single GM division throughout its long 25-year production life. In its most basic form the Quadrajet was produced as the “4MV” (automatic choke/manifold choke stove), “4MC” (automatic choke, integral choke heat coil, heat tube) and the “4M” (manual choke).

What CFM is my Quadrajet?

Quadrajets can range anywhere in between 600 and 800 CFM. Most are rated 750 CFM or higher. Quadrajets are used by many GM street car enthusiasts; however, they are also disliked by just about as many.

How do I know what Rochester carb I have?

All Rochester Quadrajet carburetors are identified by a seven- or eight-digit GM part number. On units made before mid-1968, the part number was stamped around the outside edge of a round metal tag attached to the fuel bowl.

Are Quadrajet carburetors any good?

The truth is, a properly tuned Quadrajet can be just as efficient and reliable as a bolt-on substitute performance carburetor. The Quadrajet has many model designations; the most adaptable units were designated as 4M, 4MC and 4MV, and most were rated at 750cfm until 1972 when their rating was increased to 800cfm.

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Is Carter carburetor still in business?

Carter Carburetor Company in St. Louis, Missouri, was established in 1909, and ceased operation in 1985. It was founded by William Carter, who started experimenting with automotive carburetors while running a successful bicycle shop.

What is a divorced choke quadrajet?

PHOTO 3 A divorced choke uses a spring housing that is separate from the carburetor body. Some Rochester Quadrajet carburetors employed a divorced choke spring that is very sensitive to intake manifold heat to open the butterfly.

Who makes quadrajet carburetor?

The Quadrajet is a four barrel carburetor, made by the Rochester Products Division of General Motors. Its first application was the new-for-1965 Chevy 396ci engine.

How tall is a quadrajet carb?

Two said the height was around 3-3/8″ and the post above at 3-1/4″. The gasket that was originally on the bottom of the carb may have been pretty thick. A couple of sources noted it was 0.250″ or 1/4″ thick. The cowl induction spacer is 1-7/8″ tall.

What does CFM mean?

Posted by Curt Wible. The blower in a range hood is sized, or rated, by CFM the cubic feet of air moved per minute. It is important to correctly size a range hood based on your stove, room size, and ductwork.

How do I identify my Rochester 2 barrel carburetor?

All Rochester carburetors are identified by a seven- or eight-digit part number. The earliest units, made before mid-1968, had a triangular metal tag attached to the fuel bowl. The seven-digit part number is listed on the tag. You occasionally find original carburetors with an anodized tag of various colors.

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How do you decode a Rochester carburetor?

ID numbers for a Rochester Quadrajet carburetor are found next to the throttle level. How to Decode Rochester Quadrajet Carburetor Numbers

  1. Check the first three digits.
  2. The next digit identifies the exact production year.
  3. The next digit indicates the carburetor model.

Is a quadrajet worth rebuilding?

A full and in-depth article of the rebuild process that Jet Performance takes with a Q-Jet Carburetor, by Dragzine.

What carbs replace quadrajet?

New Holley Sniper EFI is Direct Replacement for Q-Jet Carb. Holley/MSD is thrilled to announce the release of Sniper EFI Systems for Quadrajet applications, which eliminate the need to continually rebuild 50-plus-year-old Quadrajet carburetors on classic Chevys, Pontiacs, Buicks, Oldsmobiles, and GMCs.

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