Look for 4 numbers followed by a S. Example 3445S. You may find other numbers stamped on the carburetor, but they are usually the part numbers of the part they are stamped on. An example would be 0-1654S. We have carburetor kits for most Carter AFB Carburetors including the 4000 compi...
How to Rebuild and Powertune Carter/Edelbrock Carburetors: Covers AFB, AVS and TQ Models for Street, Performance and RacingShepardLarry