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L79 Intake Manifold

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  • Tom Austin
    #1

    L79 Intake Manifold

    I've been looking for an L79 intake maniold for a while to complete my engine restoration. I understand the correct manifold has PN "3890490" stamped behind where the carb mounts. I bought (I think!!!) the correct manifold @ the Goodguys swap meet in Hershey last week. The manifold is identical to every one I've ever seen - with one exception. The manifold I bought has the same part number, but is missing the middle "0". It's stamped with "389" - then a blank space (clearly no number at all)- and the "490". The "0" is simply missing and there is no indication that this number has been ground off - it's just not there. Any thoughts???
    Thanks!!!
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    • Joe C.
      Expired
      • August 31, 1999
      • 4598
      #2
      Re: L79 Intake Manifold

      Tom:

      If it has the Winters' Foundry casting logo, then it is probably the real McCoy. Sometimes it is simply a casting flaw that causes some characters to be missing or incomplete. You say that the number is STAMPED, you probably mean that it is cast.

      Joe
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        • Tom Austin
          #3
          Re: L79 Intake Manifold

          Joe,

          Thanks for the response. Yes, it has the Winter's Foundry casting logo, and the numbers are cast (not stamped). It's just missing the middle "0". Additionally, there is a letter cast below the "389" - the letter "M".???

          Tom
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            • Jack H.
              Extremely Frequent Poster
              • April 1, 1990
              • 9906
              #4
              Re: L79 Intake Manifold

              It's not uncommon for cast mold inserts to wind up delivering 'poor fill' characteristics with some numbers/letters oblitherated. I've got an early '4911 water pump where the first '1' digit is virtually missing and there's no sign of external tampering. Also, I've seen similar fill 'hiccups' on many other cast pieces...

              As far as the 'M' goes, foundries used other characters/marks for source identification (What line was it cast on? What mold produced a specfic part?). It's not a big deal...
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                • Joe C.
                  Expired
                  • August 31, 1999
                  • 4598
                  #5
                  Re: L79 Intake Manifold

                  Tom:

                  It is part of "G M", which should appear just below the casting number. Another casting flaw.........the "G" is missing.

                  Joe
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                    • Paul L.
                      Expired
                      • November 1, 2002
                      • 1414
                      #6
                      Re: L79 Intake Manifold

                      I have another variation on the casting flaw theme in my basement.
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