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Carter Carburator CFM Rating

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  • Mark
    #1

    Carter Carburator CFM Rating

    I have searched through my shop manuals and cannot find the CFM rating of the Carter AFB Model 3721 carburator. Can anyone with a more extensive library help? Thanks.
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    • Eric Eade
      #2
      Re: Carter Carburator CFM Rating

      Mark, In the Carter carb tuning manual it shows that the AFB's in the early 60's ran in a range of 450 to 625cfm. The book that I am refering to stated that Carter did not flow rate those carbs during the earlier years, however the numbers listed were based on venturi and throttle bore. Lastly it states that Chevrolet had a unit that flowed 625cfm that was quite popular for a number of years but it doesn't list the year range.

      I am not sure if this refers to the 65 model that you are talking about but I hope others with more info can fill in the blanks. Hope this helps - Eric
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        • Eric Eade
          #3
          Re: Carter Carburator CFM Rating

          Mark, In the Carter carb tuning manual it shows that the AFB's in the early 60's ran in a range of 450 to 625cfm. The book that I am refering to stated that Carter did not flow rate those carbs during the earlier years, however the numbers listed were based on venturi and throttle bore. Lastly it states that Chevrolet had a unit that flowed 625cfm that was quite popular for a number of years but it doesn't list the year range.

          I am not sure if this refers to the 65 model that you are talking about but I hope others with more info can fill in the blanks. Hope this helps - Eric
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            • Joe L.
              Beyond Control Poster
              • February 1, 1988
              • 43193
              #4
              Re: Carter Carburator CFM Rating

              Mark----

              I believe that the Carter 3721 was 600 or 625 cfm.
              In Appreciation of John Hinckley
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                • Joe L.
                  Beyond Control Poster
                  • February 1, 1988
                  • 43193
                  #5
                  Re: Carter Carburator CFM Rating

                  Mark----

                  I believe that the Carter 3721 was 600 or 625 cfm.
                  In Appreciation of John Hinckley
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                    • Richard E.
                      Expired
                      • November 1, 1976
                      • 200
                      #6
                      Re: Carter Carburator CFM Rating

                      Mark- I have a book on Carter Carburetors that I got thru the NCRS Library. On page 11, it lists the 3721 as 575 CFM, along with corresponding venturi sizes etc. Cheers-
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                        • Richard E.
                          Expired
                          • November 1, 1976
                          • 200
                          #7
                          Re: Carter Carburator CFM Rating

                          Mark- I have a book on Carter Carburetors that I got thru the NCRS Library. On page 11, it lists the 3721 as 575 CFM, along with corresponding venturi sizes etc. Cheers-
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