Mopar CFM Ratings for Carburetors

Carter CFM Ratings

As per the Carter Catalog

AFB Carburetor for the 273
1965 .... #3853 and #3854
1966 .... #4119 and #4120
1967 .... #4294 and #4295

Primary ......... 1.437" {Venturi > 1.063"}
Secondary ..... 1.563" {Venturi > 1.250"}

As per Chrysler, this Carburetor was 'advertised' at 500 CFM.

But, the Hustle Stuff Catalog listed it at 460 CFM.

Our testing back in the day, had the best one performing
at 517 CFM {W.O.T.} with some 'tweaking'.