Carter 4V AFB Carburetor. Number 4131S 4bbl AFB – 383- 440 ci – 1966 -1967 Used on Dodge Coronet, Charger, Plymouth Belvedere, Satellite, GTX and Polara, Fury with 383 engine. Chrysler New Yorker, and Imperial with 440 engine and auto transmission. Throttle valves, all linkages, and choke move beautifully and the screws turn as they should. Date B6 for February, 1966. Original tag says 4131S. The spring is not damaged or broken. No cracks. Extremely clean.