- 1 Are Quadrajet carburetors any good?
- 2 How do I identify a Quadrajet carburetor?
- 3 Is a Quadjet carb worth rebuilding?
- 4 How many parts are in a Quadrajet carburetor?
- 5 What carbs replace quadrajet?
- 6 How a Quadrajet carburetor works?
- 7 What size is a Quadrajet carburetor?
- 8 Where are the numbers on a Quadrajet carburetor?
- 9 Are Rochester carburetors still made?
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.
How do I identify a Quadrajet carburetor?
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 Quadjet carb worth rebuilding?
A full and in-depth article of the rebuild process that Jet Performance takes with a Q-Jet Carburetor, by Dragzine.
How many parts are in a Quadrajet carburetor?
Rochester QUADRAJET 4 Barrel Carburetor Parts.
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.
How a Quadrajet carburetor works?
Quadrajet carburetors have mechanical secondary throttle plates operated by a progressive linkage; the primaries open before the secondaries, and use on-demand air valve plates above the secondary throttle plates. The air valves are connected by a cam and linkage to the secondary fuel metering rods.
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.
Where are the numbers on a Quadrajet carburetor?
ID numbers for a Rochester Quadrajet carburetor are found next to the throttle level. There should be a metal disc affixed to the carburetor for those in the 1965 to 1968 range, and the number was stamped into the unit without a metal disc on the later-year models. This is the number you need for decoding.
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.