3704911 water pump, GM 2 or GM 4? - NCRS Discussion Boards

3704911 water pump, GM 2 or GM 4?

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  • Alexander C.
    Expired
    • June 20, 2010
    • 353

    3704911 water pump, GM 2 or GM 4?

    For a 3704911 water pump for a 1956 Corvette built in Sept, is the GM 4 or GM 2 casting most correct? I don't even know the difference?

    Thanks!
  • John H.
    Beyond Control Poster
    • December 1, 1997
    • 16513

    #2
    Re: 3704911 water pump, GM 2 or GM 4?

    Originally posted by Alexander Claytor (51884)
    For a 3704911 water pump for a 1956 Corvette built in Sept, is the GM 4 or GM 2 casting most correct? I don't even know the difference?

    Thanks!
    Alex -

    Makes no difference - that's a foundry pattern number for internal traceability, not a date; there were multiple patterns for volume castings.

    Comment

    • Alexander C.
      Expired
      • June 20, 2010
      • 353

      #3
      Re: 3704911 water pump, GM 2 or GM 4?

      Understood, thanks again!

      Alex

      Comment

      • Paul M.
        Very Frequent User
        • November 1, 1987
        • 142

        #4
        Re: 3704911 water pump, GM 2 or GM 4?

        I think you need the one with the 2 weep holes not the single hole.

        Comment

        • Alexander C.
          Expired
          • June 20, 2010
          • 353

          #5
          Re: 3704911 water pump, GM 2 or GM 4?

          Originally posted by Paul Mazut (12070)
          I think you need the one with the 2 weep holes not the single hole.
          Good to know, I didn't know there was a difference in the castings.

          Thanks!

          Comment

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