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840 head question

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  • John K.
    Expired
    • December 2, 2010
    • 24

    840 head question

    I have a set of 8919840 heads one has GM3Tcast in it the other has GM4T what is the difference.. if any?
  • Steven C.
    Very Frequent User
    • April 30, 2002
    • 199

    #2
    Re: 840 head question

    John, is the casting #3919840?

    Comment

    • John K.
      Expired
      • December 2, 2010
      • 24

      #3
      Re: 840 head question

      yes on both of them

      Comment

      • William C.
        NCRS Past President
        • May 31, 1975
        • 6037

        #4
        Re: 840 head question

        I believe that is the ID for the core box that was used to produce the sand core.
        Bill Clupper #618

        Comment

        • John K.
          Expired
          • December 2, 2010
          • 24

          #5
          Re: 840 head question

          Thanks for the info

          Comment

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