Manifold vacuum fitting orientation- '70 LS5

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Mark E.
    Extremely Frequent Poster
    • April 1, 1993
    • 4457

    Manifold vacuum fitting orientation- '70 LS5

    Which way should the port on this fitting be pointed and its vacuum hose be routed? [IMG]file:///C:%5CUsers%5CMark%5CAppData%5CLocal%5CTemp%5Cmsoht mlclip1%5C01%5Cclip_image002.png[/IMG]

    The only reference I found in AIM was J50-A1 (the power brake section), but my car doesn't have PB.

    Currently, the port is at 4 o'clock (looking from above with the front at 12 o'clock) with its hose going between the two ignition cable brackets, then bending to the right to go along the center plenum panel ("firewall"), then to the reserve tank. The vacuum filter is over the rear of the right valve cover. See photo below. And yes, I know the fitting is incorrect and should have only one port.




    I saw a restored '70 LS5 top flight car at Frisco with its port at about 9 o'clock and the hose routed between the coil and left valve cover. Its vacuum filter was near the manifold fitting, under the air cleaner. I first saw this with the air cleaner removed but it was installed when I later took the photo below. Note that unlike my car, this one has PB. (Side bar: I just noticed that this car doesn't have an ignition cable bracket spot welded to the left valve cover. Interesting.)

    <Problem uploading photo>

    The hose routing on the top flight car is more direct and looks cleaner. But the longer hoses on my car look original and would be too long if rerouted like the top flight car. When I asked a couple judges at Frisco about this, they weren't sure.

    Anyone know what's TFP?

    Thanks folks!
    Mark Edmondson
    Dallas, Texas
    Texas Chapter

    1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
    1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top
  • Alan S.
    Extremely Frequent Poster
    • August 1, 1989
    • 3413

    #2
    Re: Manifold vacuum fitting orientation- '70 LS5

    Hi Mark,
    I was looking through the LS5 thread on the CF hoping for some original engine pics and came upon your posts and your CAR!
    QUITE a nice looking paint job you did!
    A beauty!
    Regards,
    Alan
    71 Coupe, 350/270, 4 speed
    Mason Dixon Chapter
    Chapter Top Flight October 2011

    Comment

    • Mark E.
      Extremely Frequent Poster
      • April 1, 1993
      • 4457

      #3
      Re: Manifold vacuum fitting orientation- '70 LS5

      Thanks Alan. It's a lacquer job sprayed in my garage.

      For some reason, I cannot post the photo of the Top Flight '70 mentioned in my last post. I can upload other photos so the problem seems unique to that one. Odd.

      Anyway, as I described earlier, the manifold vacuum fitting on that car points to the left of the car (almost opposite of mine) with its hose routed between the ignition shielding and the rear of the left valve cover as it goes to the plenum (firewall).

      Any help understanding the proper routing of this hose is appreciated.

      Best,
      Mark Edmondson
      Dallas, Texas
      Texas Chapter

      1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
      1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

      Comment

      • Mark E.
        Extremely Frequent Poster
        • April 1, 1993
        • 4457

        #4
        Re: Manifold vacuum fitting orientation- '70 LS5

        The photo of my engine in the first post no longer appears for some reason. Here it is again:
        Top of Engine 2015 4.jpg
        Mark Edmondson
        Dallas, Texas
        Texas Chapter

        1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
        1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

        Comment

        • Kevin G.
          Expired
          • February 1, 2005
          • 1066

          #5
          Re: Manifold vacuum fitting orientation- '70 LS5

          My 71 LS 5 has the fitting facing the same as the 70 you describe. About 180* different direction then your picture illustrates.

          Comment

          • Mark E.
            Extremely Frequent Poster
            • April 1, 1993
            • 4457

            #6
            Re: Manifold vacuum fitting orientation- '70 LS5

            Originally posted by Kevin Goodman (43429)
            My 71 LS 5 has the fitting facing the same as the 70 you describe. About 180* different direction then your picture illustrates.
            Does your '71 have PB? I'm wondering if that makes a difference.
            Mark Edmondson
            Dallas, Texas
            Texas Chapter

            1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
            1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

            Comment

            • Kevin G.
              Expired
              • February 1, 2005
              • 1066

              #7
              Re: Manifold vacuum fitting orientation- '70 LS5

              Nope, no power anything.... Pure HP!

              Comment

              • Mark E.
                Extremely Frequent Poster
                • April 1, 1993
                • 4457

                #8
                Re: Manifold vacuum fitting orientation- '70 LS5

                Originally posted by Kevin Goodman (43429)
                Nope, no power anything.... Pure HP!
                And with our engine, pure torque. Reminds me of the old saying, "people buy HP, but drive torque".
                Mark Edmondson
                Dallas, Texas
                Texas Chapter

                1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
                1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

                Comment

                • Mark E.
                  Extremely Frequent Poster
                  • April 1, 1993
                  • 4457

                  #9
                  Re: Manifold vacuum fitting orientation- '70 LS5

                  So is there general agreement that for LS5 engines the manifold vacuum port going to the vacuum reserve tank points to the left side of the engine?
                  Mark Edmondson
                  Dallas, Texas
                  Texas Chapter

                  1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
                  1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

                  Comment

                  Working...
                  Searching...Please wait.
                  An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

                  Please push the back button and reload the previous window.'
                  An unexpected error was returned: 'Your submission could not be processed because the token has expired.

                  Please push the back button and reload the previous window.'
                  An internal error has occurred and the module cannot be displayed.
                  There are no results that meet this criteria.
                  Search Result for "|||"