1967 Holley Carb

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  • James L.
    Frequent User
    • July 1, 1986
    • 33
    #1

    1967 Holley Carb

    I have a Holley 4 barrel removed several years ago from my 1967 427-390. The air horn is marked as follows:
    3906633-EO
    LIST - 3811
    0454

    The part number and Holley list are correct for the engine but I can't decipher the "-EO" following the part number or the date. The 1967 judging manual indicates that the date will be a three character numeric or alphabetic stamping.

    Can anyone help me with these pieces of data? Thanks.

    JimL
    Tags: None
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    • Mike M.
      Director Region V
      • September 1, 1994
      • 1463
      #2
      Re: 1967 Holley Carb

      Hi Jim
      The 4 digits are a service replacement Julian date format rather than the coded Numeric Year, Alpha Month, Numeric Shift code listed in the JG.
      The date on your carb would be: the 45th day of '74, '84, '94.....
      See you in Marlborough.
      HaND
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        • James L.
          Frequent User
          • July 1, 1986
          • 33
          #3
          Re: 1967 Holley Carb

          Mike
          Thanks. Simple but logical. I removed it originally because I knew the date was wrong. Any idea what the "EO" after the part number designates?
          See you in Marlborough with my '66.
          Jim
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            • Clem Z.
              Expired
              • January 1, 2006
              • 9427
              #4
              Re: 1967 Holley Carb

              i have seen a 3810 with a 3906631-DA so i would guess EO is a Holley code for what changes have been incorporated into the carb since the original design
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