Readers ask: What Was The First Year That Gm Used The Quadrajet Carburetor On Small Block Chevy Moto?

How do you tell what Quadrajet I have?

If the Quadrajet you’re looking at has a seven-digit part number ranging from 702 through 704, these were built before 1976. On these units, the number immediately following these three digits, will designate the actual year of production. After that, you will find either a 2, or a 5.

Are Rochester Quadrajet carburetors any good?

A lot of good and bad has been written about the use of a Rochester Quadrajet carburetor as a replacement four-barrel. Some enthusiasts love them while others avoid them like the plague. The truth is, a properly tuned Quadrajet can be just as efficient and reliable as a bolt-on substitute performance carburetor.

Who made Quadrajet carbs?

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.

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).

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What size is a Quadrajet carburetor?

As we mentioned, the Quadrajet is a spread-bore design carburetor, using 1-3/8″ primary bores and 2-1/4″ secondaries. The smaller primary bores give the carburetor better idling and low-load fuel economy. The larger secondary bores are regulated by tapered metering rods which set the air to fuel mixture.

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.

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.

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.

Are Rochester carburetors still made?

In 1995 Rochester became part of Delphi, which in turn became a separate company four years later, and continues to manufacture fuel injection systems in Rochester, now part of General Motors Automotive Components Holdings- Rochester Operations.

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.

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How many CFM is a Rochester 2 barrel?

Carb Sizes and CFM The cfm (cubic feet per minute-a measure of how much air the carburetor can flow) on the Rochester 2G ranges from about 225 cfm in the smallest applications up to what Rochester calls a 435 cfm.

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