How do I identify a Rochester 2 jet carburetor?

All Rochester carburetors are identified by a seven- or eight-digit part number. The earliest units, made before mid-1968, had a triangular metal tag attached to the fuel bowl. The seven-digit part number is listed on the tag. You occasionally find original carburetors with an anodized tag of various colors.

What CFM is a Rochester 2gc 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.

How do you adjust a 2 barrel carburetor?

For 2 and 4 barrels with the engine running and at idle, start with either screw and turn it in a ½ turn (clockwise). Then go to the other and turn it in ½ a turn. You want to keep them equal.

How do you decode a Rochester carburetor?

Most Rochester-built Quadrajet carburetors were given a four-number date stamp. This code can be deciphered as such: the first three numbers are the day of the year (082x = 82nd day of the year) the carburetor was built. The last number is the year (0828 = 82nd day of 1968).

What kind of carburetors does a Rochester 2 jet have?

There are four basic model “2-Jet” Rochester carburetors. They are the Models 2G, 2GC, 2GV and 2GE. There are two different throttle body flanges used on the Rochester 2-bore carburetors. They are SAE (1-1/4″) and (1-1/2″).

What does 2G mean on a Rochester carburetor?

There are three basic models of the Rochester 2 barrel carburetor. They are 2G, 2GC and 2GV. 2G simply means that it is a two bore carburetor. Typically the Rochester 2 barrel carburetor is used on V-8 engines where each bore supplies air and fuel to 4 cylinders through a divided intake manifold.

When did 2G carburetors come out?

Rochester 2G carburetors came in two basic groups: big and small. The small 2 Jets were used until the early 70’s, where they last appeared on 307 Chevy engines. Large 2 Jets, with a bigger bolt pattern, started in the late 60’s on BOP engines.

What kind of throttle body flanges are used on Rochester 2 bore carburetors?

They are the Models 2G, 2GC, 2GV and 2GE. There are two different throttle body flanges used on the Rochester 2-bore carburetors. They are SAE (1-1/4″) and (1-1/2″). Larger engines normally have more air capacity, hence, larger carburetor bores and flanges are needed on these applications.