Question: Who Makes Quadrajet Carburetor?

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.

Does Edelbrock make Quadrajet?

Edelbrock.com: New Carburetors – Quadrajet Rebuild Kit Jet Spacer Hose Pump.

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.

How do I know what Quadrajet carburetor 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.

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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Are all Quadrajet spread-bore?

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.

Is Edelbrock 1406 a square bore?

The Edelbrock 1406 has an electric choke and mates to your intake manifold with a square bore flange. The silver finish and single inlet design is also part of Edelbrock’s legendary two-piece, all-aluminum constructed carburetor.

Are Edelbrock carbs square bore?

The Edelbrock Square-bore Carb to Spread-bore Manifold Adapter #2697 is designed to allow installation of the Edelbrock Performer Series carburetor on vehicles with the OEM (original equipment) spread-bore intake manifold (typically GM vehicles that were originally equipped with the Rochester Quadra jet carburetor).

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.

How big is a Quadrajet?

Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions.

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.

How many CFM is a quadrajet carb?

Most Quadrajets were capable of 750 cu ft (21,000 l)/min (cfm) maximum, but some rare Buick and Pontiac models were capable of 800 cu ft (23,000 l)/min for use on high performance engines, and most 1984-1987 pickup trucks were also equipped with the 800-cfm carb.

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How does a Quadrajet carburetor work?

When the throttle is floored the butterflies open in the throttle plate and allow air to rush by in lockstep with the engine piston velocity. The amount of air then controls how quickly the secondary air valve is blown open. The metering rods lift and allow fuel flow from the secondary jets.

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