How do I know if my Quadrajet is carb?

All Rochester carburetors, including the Quadrajet, are identified by a 7-digit or 8-digit part number; the earliest units, made before mid-1968, had a round metal tag attached to the fuel bowl. The 7-digit part number ran around the outside edge of the tag.

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.

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.

Who made Quadrajet carbs?

The Quadrajet four-barrel carburetor was produced by the Rochester Carburetor Division of General Motors from 1965-’90. It was produced in many forms, including electronic-control from 1980-’90, for a wide variety of GM applications.

Is a quadrajet carb good?

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

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 size is a quadrajet?

Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs.

What causes a carburetor to run lean?

A power valve that is too small may not increase fuel flow enough under load, causing the A/F to go lean. A low fuel level can make the A/F ratio run lean, while a fuel level that is too high can make the carburetor run rich or even flood the engine with fuel.

Where can I find parts for my Holley carburetor?

Find the parts for your carburetor here. Carburetor Training Class Announced for 2020! How to Choose Your Next Holley Carburetor! The Holley technical resource library. If you have questions about our products, need a part recommendation, or just cant seem to find what you need you can contact our Tech Support online and receive answers by e-mail.

What kind of carburetor does a 750 CFM Quadrajet have?

When looking through the primaries, if you see a pronounced bulge protruding from the side of the wall surface, you have an 800 cfm carburetor. The primary wall of the 750 cfm unit does not have this bulge, and is consistent throughout. In the early ’80s, GM incorporated electronic connections to the Quadrajet.

What is the CARB ID on a Rochester Monojet?

Rochester Carb ID Carburetor Identification GM Rochester Rochester 1 barrel B BC BV Full Size View Parts Page Diagram Rochester 1 barrel M MV 1ME 1MV Monojet Parts Page Diagram Rochester 2 barrel 2G 2GC 2GV 2GE Two Jet Full Size View

When did the Rochester Quadrajet carburetor come out?

The Quadrajet was actually the successor to the previously-built Rochester 4GC carburetor that was manufactured from 1952 to 1967. This new carburetor was blended with what Rochester knew about carburetors, mixed with ideas from other manufacturers, (spread-bore design and vacuum secondaries).

How do I know if my Quadrajet is carb? All Rochester carburetors, including the Quadrajet, are identified by a 7-digit or 8-digit part number; the earliest units, made before mid-1968, had a round metal tag attached to the fuel bowl. The 7-digit part number ran around the outside edge of the tag. How many CFM…