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66 Holly Carb dating

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  • John F.
    Very Frequent User
    • July 31, 1999
    • 105
    #1

    66 Holly Carb dating

    I'm looking at buying a Holley carb for my 66 327/300. It is a List 3367 with a date code of 3465. I understand this uses a Julian calendar dating scheme. The JG does not seem to allow for use of the Julian calendar, but Allen Colvins "Corvette by the Numbers" explains that both the 3 digit system described in the JG and the Julian system were used until 1972 when only the Julian calendar was applied. Would a carb with the 4 digit date be considered correct for judging purposes or is this a service replacement?

    John
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    • Terry M.
      Beyond Control Poster
      • September 30, 1980
      • 15573
      #2
      Re: 66 Holly Carb dating

      I can't tell you about mid-years -- but I can tell you that for 1968-1972 (the only factory Holley equipped C3 Corvettes) the Julian dating system WILL receive a date deduction -- in spite of what Alan Colvin says. I would expect the same for mid-years, but I don't know that for a fact. There are lots of people here who do know though, so hang on.
      Terry
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        • Larry M.
          Extremely Frequent Poster
          • January 1, 1992
          • 2688
          #3
          Re: 66 Holly Carb dating

          I would expect to see a three digit date code on an original 1966 Holley carb (YEAR/MONTH/WEEK OF MONTH).

          One with a four digit code would be judged as a service replacement. Deduction(s) would be for the date and any other minor changes/deviations from known original (ie. fuel bowl screw heads, fuel bowl configuration, other stampings and codes, etc, etc)

          Larry
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            • William C.
              NCRS Past President
              • May 31, 1975
              • 6037
              #4
              Re: 66 Holly Carb dating

              Not the first error in Colvin's book...
              Bill Clupper #618
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                • John F.
                  Very Frequent User
                  • July 31, 1999
                  • 105
                  #5
                  Re: 66 Holly Carb dating

                  Thats what I figured. Thanks guys.

                  John
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                    • John H.
                      Beyond Control Poster
                      • December 1, 1997
                      • 16513
                      #6
                      Re: 66 Holly Carb dating

                      Originally posted by John Farren (32715)
                      Allen Colvins "Corvette by the Numbers" explains that both the 3 digit system described in the JG and the Julian system were used until 1972 when only the Julian calendar was applied. John
                      John -

                      If you'll re-read that sentence on page 183, it says "Holley used both these systems of dating but only used the four-digit code after the 1972 model year". The two dating charts on page 184 are separated, with the 1963-1972 chart showing three digits, and the 1972-1975 chart showing four digits.
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                        • John F.
                          Very Frequent User
                          • July 31, 1999
                          • 105
                          #7
                          Re: 66 Holly Carb dating

                          I obviously misinterpreted this. Thanks for pointing it out.

                          John
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                            • Philip C.
                              Extremely Frequent Poster
                              • December 1, 1984
                              • 1117
                              #8
                              Re: 66 Holly Carb dating

                              Originally posted by William Clupper (618)
                              Not the first error in Colvin's book...
                              Not for nothing Bill but I think his books have a better average than we do. Phil 8063
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