Decode your Rochester Carburetor

Decode your Rochester Carburetor

The following information covers how to decode your Rochester Carburetor:

The carbs are found in two forms, one produced prior to 1976, one produced after 1976. Examples of each form are as follows:

Pre-76

Example: 7028219 DG1938

70 2 8 2 1 9

DG 193 8

70 - Prefix code. "70" will appear on all late '60's Rochester Carburetors.

2 - Decade produced.

2 - 1960's

3 - 1060's with A.I.R.

4 - 1970-1975

8 - Year produced. 8 = 1968

2 – Model

0 - Monojet (1 bbl) Federal standards

1 - Two jet (2 bbl) Federal standards

2 - Quadrajet (4 bbl) Federal standards

3 - Monojet (1 bbl) California standards

4 - Two jet (2 bbl) California standards

5 - Quadrajet (4 bbl) California standards

6 - VariJet (2 bbl) Fed

1 - Division.

0, 1, and 2 all indicate Chevrolet.

4 – Buick

5 – Olds

6,7 – Pontiac

9 – Transmission

Even numbers - Automatic Transmission

Odd numbers - Manual Transmission

DG - Customer code.

1938 - Date Code

193 - 193rd Day of the year

8 – Year

Produced 1976 or later

Example: 17080243 2629CNO

170 8 0 2 4 3

262 9 CNO

170 - Prefix Code

8 - Decade Produced

5 - 1976-1979 (1705)

8 - 1980's (1708)

0 - Year Produced