How many CFM is a Rochester 4gc?

How many CFM is a Rochester 4gc?

Produced in 486, 553, and 692 CFM ratings, the 4G uses a squarebore layout with a conventional fixed jet, power valve and accelerator pump metering scheme.

How do I know what Rochester 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.

Are Rochester carburetors good?

The good news, though, is that with the right tuning modifications, a Rochester can be a very good carburetor with great throttle response on the racetrack.” Jet Performance Products specializes in turning ordinary Q-jet cores into race-ready carburetors.

What CFM is a Rochester 2 barrel carburetor?

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.

Where are the numbers on a Rochester Quadrajet carburetor?

There are a couple of locations containing the codes needed to identify your Quadrajet; both are located on the driver side of the carb body. Early Q-jets used a circular tag stamped with the codes found in a cavity in the side of the float bowl, while later carburetors used a stamping on the body of the carb.

Is the Rochester Quadrajet a good carb?

The truth is, a properly tuned Quadrajet can be just as efficient and reliable as a bolt-on substitute performance carburetor. And because they were used on so many original-equipment applications, they are readily available from many used parts suppliers at a very reasonable cost.

What size is a Rochester 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.

Is Rochester carburetor still in business?

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 a Quadrajet worth rebuilding?

Yes, They Are Worth It – Jet Performance Products.

What CFM is a Rochester Quadrajet?

Quadrajets can range anywhere in between 600 and 800 CFM. Most are rated 750 CFM or higher.

Is a Rochester a good carburetor?

In its stock form, the Rochester Quadrajet carburetor often gets a bad rap, but with a bit of work, it can be a very capable performer. The long-discontinued carburetor remains popular with performance rebuilders and tuners.