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68 block date code

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  • ray anthony

    68 block date code

    Trying to verify 1968 engine block date code on a 427 CID 390 HP. The date code now reads J2068. I thought it should read J208. I thought the year was always the last digit not the last two digits. Thanks for any help you may offer.
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43193

    #2
    Re: 68 block date code

    ray------

    With Tonawanda castings (where all big blocks originally installed in Corvettes were cast), a 2 digit casting date for the year is often used.
    In Appreciation of John Hinckley

    Comment

    • Richard F.
      Very Frequent User
      • May 31, 1986
      • 193

      #3
      Re: 68 block date code

      The 5439 block in my 68 is dated C78.

      Comment

      • Joe L.
        Beyond Control Poster
        • February 1, 1988
        • 43193

        #4
        Re: 68 block date code

        Richard-----

        Tonawanda blocks are seen both ways. That is with both 1 and 2 character year codes.
        In Appreciation of John Hinckley

        Comment

        • ray anthony

          #5
          Re: 68 block date code

          To Joe and Richard , Thanks for the quick response, greatly appreciated.

          Comment

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