1bbl Aluminum intake

Slant 6 Engines

  1. TF360

    TF360 Well-Known Member

    Messages:
    1,645
    Likes Received:
    508
    Joined:
    Apr 25, 2014
    Location:
    Florida
    Local Time:
    8:20 AM
    Picked up a Aluminum 1bbl intake. Its newer than my 74, and I noticed that the vacuum port for the power brakes has a little valve in it. Can it be taken out? Wondering if I hook a hose to it if it will breath. Looks like a tire valve inside. There is a electrical connector on there too. Thanks for any help.
     
  2. Locomotion

    Locomotion Well-Known Member

    Messages:
    2,932
    Likes Received:
    468
    Joined:
    May 31, 2004
    Location:
    Florida
    Local Time:
    8:20 AM
    I don't know much about /6, but just wondering if it may be a Feather Duster/Dart Lite /6 intake. If you know the application (casting number), maybe someone more familiar with it can offer more info.
     
    • Agree Agree x 1
    • valiantpatrol

      valiantpatrol FABO Gold Member FABO Gold Member

      Messages:
      933
      Likes Received:
      135
      Joined:
      Apr 21, 2009
      Location:
      Tucson, AZ
      Local Time:
      6:20 AM
      I just looked at one, a two piece, aluminum 1bbl with an EGR provision. It has two threaded ports on the number six runner instead of the typical single port of non-smog/earlier manifolds. These ports are standard female NPT threads. Likely whats in yours can be removed based on what I see here on this one.
       
      • Thanks! Thanks! x 1
      • TF360

        TF360 Well-Known Member

        Messages:
        1,645
        Likes Received:
        508
        Joined:
        Apr 25, 2014
        Location:
        Florida
        Local Time:
        8:20 AM
        I was hoping I could get away without removing it. Don't want to crack the aluminum. What's the best way to get it out without cracking it?
         
      • valiantpatrol

        valiantpatrol FABO Gold Member FABO Gold Member

        Messages:
        933
        Likes Received:
        135
        Joined:
        Apr 21, 2009
        Location:
        Tucson, AZ
        Local Time:
        6:20 AM
        If it's in one of those two rear ports on the number 6 runner it should unscrew. Those two ports i'm referring to have a raised ring/body that reinforces the threads and should prevent them from breaking. If you do try to unscrew what's in there make sure you grab it and not any part of the aluminum. Drilling it out is another option. While not what I consider a preferred method, you could J-B weld the opening closed also. A pic would help.
         
        • Agree Agree x 1
        • TF360

          TF360 Well-Known Member

          Messages:
          1,645
          Likes Received:
          508
          Joined:
          Apr 25, 2014
          Location:
          Florida
          Local Time:
          8:20 AM
          Let me get a Pic
           
        • TF360

          TF360 Well-Known Member

          Messages:
          1,645
          Likes Received:
          508
          Joined:
          Apr 25, 2014
          Location:
          Florida
          Local Time:
          8:20 AM
          Ok here is what the port looks like. Will the center unscrew. I really don't want to remove the whole thing-don't want to crack the intake.

          intake.jpg
           
        • jos51700

          jos51700 Well-Known Member

          Messages:
          5,274
          Likes Received:
          1962
          Joined:
          May 24, 2009
          Location:
          Bel-Ray
          Local Time:
          7:20 AM
          You'd be well off to leak check that before you spend too much time on it.
           
          • Agree Agree x 1
          • slantsixdan

            slantsixdan =..=

            Messages:
            6,645
            Likes Received:
            1813
            Joined:
            Jan 7, 2007
            Location:
            Vancouver BC
            Local Time:
            5:20 AM
            Just unscrew the whole thing. You almost certainly won't crack anything, but if the manifold is in such fragile condition that unscrewing this temp sensor destroys the intake, you've just dodged a bullet (doing the full install to have to do it again).

            Jos51700 is right about leak-checking—these 2-piece intakes have their advantages (light weight, better fuel distribution). Some of them were porous at the weld bead, though most of those went for scrap long ago, but it's still worth some prep to ensure you don't have this problem. See here and here. The lightweight construction also means they can tend to crack in the floor area above the exhaust hot spot, so check carefully there.
             
          • TF360

            TF360 Well-Known Member

            Messages:
            1,645
            Likes Received:
            508
            Joined:
            Apr 25, 2014
            Location:
            Florida
            Local Time:
            8:20 AM
            Ok, the whole outer part or the threaded inside part?
             
          • slantsixdan

            slantsixdan =..=

            Messages:
            6,645
            Likes Received:
            1813
            Joined:
            Jan 7, 2007
            Location:
            Vancouver BC
            Local Time:
            5:20 AM
            Unscrew the entire thing. Put a wrench (or Vise-Grips, or socket) on the big hex and crank it counterclockwise until it's out of the manifold.
             
            • Thanks! Thanks! x 1
            • BillGrissom

              BillGrissom Well-Known Member

              Messages:
              7,346
              Likes Received:
              391
              Joined:
              May 10, 2009
              Location:
              Sacramento
              Local Time:
              5:20 AM
              It appears like some type of electrical sensor, perhaps for inlet temperature. My guess is it was part of the electric choke controls. In the late 1970's, there was a thermo-resistor on top of the intake. Perhaps they moved that down into the air flow by ~1980. I vaguely recall reading that those superlight aluminum intakes were used on trucks. I have one (not installed) and it very light and fragile w/ perhaps the ugliest welds (e-beam) seen on a production part.
               
              • Agree Agree x 1
              • jos51700

                jos51700 Well-Known Member

                Messages:
                5,274
                Likes Received:
                1962
                Joined:
                May 24, 2009
                Location:
                Bel-Ray
                Local Time:
                7:20 AM
                It appears to be some sort of a thing, that does some sort of the stuff.

                Unless you put the whole car on a diet and start taking Anorexia with every meal yourself, you have zero incentive to use that thing. You'd need an accelerometer to measure any difference in the gain from installing it, and that's only because your wallet will be lighter too, after you buy gaskets.
                 
                • Disagree Disagree x 2
                • TF360

                  TF360 Well-Known Member

                  Messages:
                  1,645
                  Likes Received:
                  508
                  Joined:
                  Apr 25, 2014
                  Location:
                  Florida
                  Local Time:
                  8:20 AM
                  So, I changed from the factory cast iron intake and exhaust manifolds to the aluminum intake and Clifford Headers and shaved off 30lbs. That's a lot. I'm also taking weight off in other areas.
                   
                  • Like Like x 1
                  • nitro_rat

                    nitro_rat FABO Gold Member FABO Gold Member

                    Messages:
                    89
                    Likes Received:
                    27
                    Joined:
                    Apr 25, 2020
                    Location:
                    Texas
                    Local Time:
                    5:20 AM
                    I find it's much more convenient to move the aluminum intake around wether it's attached to an exhaust manifold or not! It's much lighter...
                     
                    • Agree Agree x 1
                    • Naplm00

                      Naplm00 Well-Known Member

                      Messages:
                      185
                      Likes Received:
                      38
                      Joined:
                      May 20, 2019
                      Location:
                      Bay
                      Local Time:
                      5:20 AM
                      if anyone in the Norcal area wants one there is one on a 80s D150 @ picknpull milpitas
                       
                      • Like Like x 1
                      1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                        By continuing to use this site, you are consenting to our use of cookies.