1971 LS-6 fuel line to carburetor bracket - NCRS Discussion Boards

1971 LS-6 fuel line to carburetor bracket

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  • Stanley S.
    Frequent User
    • December 13, 2007
    • 57

    1971 LS-6 fuel line to carburetor bracket

    I'm looking for the support bracket that holds the fuel line to the front passenger side of the carburetor on a LS-6. I haven't as of yet found anyone reproducing this bracket nor have I seen any on ebay. Does anyone know of a source for this bracket? Or does anyone have a good picture of its configuration so that I could fabricate one? The part number from the AIM is 3994043.

    Thanks for your help.

    Stan
  • Joe L.
    Beyond Control Poster
    • January 31, 1988
    • 43194

    #2
    Re: 1971 LS-6 fuel line to carburetor bracket

    Originally posted by Stanley Schield (48300)
    I'm looking for the support bracket that holds the fuel line to the front passenger side of the carburetor on a LS-6. I haven't as of yet found anyone reproducing this bracket nor have I seen any on ebay. Does anyone know of a source for this bracket? Or does anyone have a good picture of its configuration so that I could fabricate one? The part number from the AIM is 3994043.

    Thanks for your help.

    Stan
    Stan-------


    I know of no source for that bracket. The extremely limited market for such a bracket would not bode well for its reproduction. A functional, if not exactly correct, bracket could be rather easily fabricated. You will find a photo of an LS-6 with the bracket in the 68-72 Vette Vues Guidebook by M.F. Dobbins.
    In Appreciation of John Hinckley

    Comment

    • John C.
      Expired
      • December 31, 2004
      • 616

      #3
      Re: 1971 LS-6 fuel line to carburetor bracket

      Stan

      I'm not sure this is exactly the same as the Corvette version, but I think it would be similar.



      John

      Comment

      • Ron G.
        Very Frequent User
        • November 30, 1984
        • 865

        #4
        Re: 1971 LS-6 fuel line to carburetor bracket

        I have a pretty decent photo of the bracket on my LT-1. The only difference is that the LT-1 bracket mounts to the right rear carburetor stud and the LS -6 Mount to the right front carb stud, but it is the same bracket. Again, I will try to get you a picture over the weekend.
        "SOLID LIFTERS MATTER"

        Comment

        • Mike E.
          Extremely Frequent Poster
          • February 28, 1975
          • 5134

          #5
          Re: 1971 LS-6 fuel line to carburetor bracket

          Originally posted by John Carlson (43123)
          Stan

          I'm not sure this is exactly the same as the Corvette version, but I think it would be similar.



          John
          Unfortunately, it is not similar.

          Comment

          • Dave S.
            Extremely Frequent Poster
            • August 31, 1992
            • 2918

            #6
            Re: 1971 LS-6 fuel line to carburetor bracket

            Originally posted by Mike Ernst (211)
            Unfortunately, it is not similar.
            This should answer your question. It's on an LT-1 but they are the same bracket as Ron says.
            Attached Files

            Comment

            • Joe L.
              Beyond Control Poster
              • January 31, 1988
              • 43194

              #7
              Re: 1971 LS-6 fuel line to carburetor bracket

              Originally posted by Ron Goduti (8076)
              I have a pretty decent photo of the bracket on my LT-1. The only difference is that the LT-1 bracket mounts to the right rear carburetor stud and the LS -6 Mount to the right front carb stud, but it is the same bracket. Again, I will try to get you a picture over the weekend.
              Ron------


              I do not think that the LT-1 and LS-6 brackets are the same. The LT-1 bracket has two 90 degree offsets. The LS-6 bracket is essentially "flat".
              In Appreciation of John Hinckley

              Comment

              • Mike E.
                Extremely Frequent Poster
                • February 28, 1975
                • 5134

                #8
                Re: 1971 LS-6 fuel line to carburetor bracket

                Ron and Dave, I have to agree with Joe on this one. Not only does the AIM call out a different part number, but the LT-1 bracket has a much deeper step to it, while the LS6 is much flatter. The LS6 bracket is nearly impossible to find. I have been led to believe that there was an individual who did a VERY limited run of the LS6 brackets within the past decade or so. I think originals of each have the 7-digit part number stamped on them. (Different numbers, of course)

                Comment

                • Ron G.
                  Very Frequent User
                  • November 30, 1984
                  • 865

                  #9
                  "SOLID LIFTERS MATTER"

                  Comment

                  • Gary C.
                    Frequent User
                    • May 28, 2012
                    • 66

                    #10
                    Re: 1971 LS-6 fuel line to carburetor bracket

                    Look at 70-72 TIM pg 130 Fig. M 15.1 and pg 133 Fig. M 15.10. The one from Ecklers is similar but not the same as the one shown in the two Figures in TIM. The one on 71 LS6 is wider after the tube clamp and has a bent up flange for stiffness and much flatter than the LT1.

                    Comment

                    • Gary C.
                      Frequent User
                      • May 28, 2012
                      • 66

                      #11
                      Re: 1971 LS-6 fuel line to carburetor bracket

                      Also, the LS6 routing of tube goes above the vacuum source on carburetor base and LT1 goes below the vacuum source so the LT1 would be much deeper and closer to carb than LS6 which would be higher and further out so LT1 is not the right clamp.

                      Comment

                      • Mike E.
                        Extremely Frequent Poster
                        • February 28, 1975
                        • 5134

                        #12
                        Re: 1971 LS-6 fuel line to carburetor bracket

                        Pictures should help. The first two are of the LT-1 clamp. (repro, but other than the finish, pretty accurate). The second two are of the LS6 clamp.
                        Attached Files

                        Comment

                        • Gary B.
                          Very Frequent User
                          • July 31, 1979
                          • 926

                          #13
                          Re: 1971 LS-6 fuel line to carburetor bracket

                          Low-mileage 71 LS6. Don't have a better picture.
                          Gary B

                          Attached Files

                          Comment

                          • Joe L.
                            Beyond Control Poster
                            • January 31, 1988
                            • 43194

                            #14
                            Re: 1971 LS-6 fuel line to carburetor bracket

                            All------


                            It's easy to understand why the LT-1 fuel line support differs from the LS-6. The LT-1 engine uses a "high rise" aluminum manifold whereas the LS-6 uses a "pancake" manifold. The LT-1 uses a carb fuel line with a "Y" block; the LS-6 uses a fuel line with a "T" block. The LT-1 mounts the fuel line support on the right rear carb stud; the LS-6 mounts the support on the right front carb stud. All of these factors combine to necessitate different configurations for the fuel line support.

                            However, I do not understand why the 1970 Chevelle LS-6 (and L-78) uses a different support than the 1971 Corvette LS-6. Both applications use the same "pancake" manifold. Both applications use the "T" block carb fuel line. Both applications mount the support on the right front carb stud. And, both applications use a configurationally identical Holley carb. So, why should there be any difference in the support bracket?
                            In Appreciation of John Hinckley

                            Comment

                            • Stanley S.
                              Frequent User
                              • December 13, 2007
                              • 57

                              #15
                              Re: 1971 LS-6 fuel line to carburetor bracket

                              Thanks to all for your comments and excellent pictures. It looks like it is fabrication time. Is the finish on the bracket natural or possibly black phosphate? It is a little hard to tell from the photos.

                              Stan

                              Comment

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