Replacing my 1 bbl over to a 2bbl. Need help!

Slant 6 Engines

  1. RandyB

    RandyB Member

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    Okay here's the set up. I'm putting a Holley 2300 2 bbl 350 cfm on my 1972 dart. Replacing the intake and exhaust manifolds with a 2 bbl. Got them. Got the carb. Now I need to know what type of if any, throttle cable, kickdown linkage (now it's a rod type) and brackets I need. Thanks for your help.
     
  2. Demonic

    Demonic Well-Known Member

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    I believe you'll need a Holley #20-7 throttle lever adapter. It will allow you to keep the Mopar throttle "stud" and mount the kickdown slotted rod. About $12.- at Summit. The throttle pressure linkage must be correct, or the transmission will eventually burn clutches from lack of fluid pressure.


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    • RandyB

      RandyB Member

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      What about the kickdown linkage. I heard I have to replace it with a cable. Now it's a rod
       
    • Garrett Ellison

      Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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      Is it a factory iron two barrel intake and is the 2300 base the same or larger than the BBD pattern?
       
    • RandyB

      RandyB Member

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      It is a factory 2 bbl intake. And not sure about the size.
       
    • Garrett Ellison

      Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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      • RandyB

        RandyB Member

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        • RandyB

          RandyB Member

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          I did get this adapter with maniifold
           
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          • Garrett Ellison

            Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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            :thumbsup:
             
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            • dart19666

              dart19666 FABO Gold Member FABO Gold Member

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              Here are some pics of what I did when I set up mine. The stock super six kick down bracket worked with a little z bend put into it. The adapter for the throttle cable was able to be used also but I had to notch the bottom slightly. Other than that a bitchen set up with light years better in the power department.

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              Last edited: Feb 10, 2020
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              • slantsixdan

                slantsixdan =..=

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                • flingdingo

                  flingdingo Well-Known Member

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                  I used the Lokar stuff and made my own bracket at the manifold. Not the cheapest solution, but the free overnight shipping from Summit took some of that sting out. The car was up and running and back from a 500 mile round trip before I found the correct factory stuff.
                   
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                  • RandyB

                    RandyB Member

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                    just got email back from Lokar. They said they don't have a bracket for my Holley 2300 and for what I need it for.
                     
                  • RandyB

                    RandyB Member

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                    Just got email from Lokar. They told me they don't have a bracket that will fit my Holley 2300 and what I need it for. Bummer
                     
                  • flingdingo

                    flingdingo Well-Known Member

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                    They won't have anything for a slant, we're the red-headed step-child from a family of red-headed step-children. If we were playing with Ford 300's they would show a part #.

                    I used their TC-1000-U for the throttle, and their KD-2727-U for the kickdown. I fabbed a plate to bolt onto the throttle linkage at the carb, and used the supplied Lokar ball studs to connect the cables; and like I said, fabbed the bracket that the cables mount through. That bracket bolts to the EGR holes on the manifold. My carb is a Holley 2280 (factory replacement for the Carter BBD) but you could do something similar to my set-up.

                    I can take pictures of my setup if you want, I won't be able to post them up until late tonight though.
                     
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                    • RandyB

                      RandyB Member

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                      That would be awesome if you could send some picture. No hurry. And thank you. Fellow ginger!!
                       
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                      • Garrett Ellison

                        Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                        I’ve always liked the principal of a large two barrel carburetor on a \6 better than a four barrel. The smaller plenum/stronger vacuum signal and the larger bores and venturis of a 2300 Holley would work well together. Fuel thirsty but simple. At one time, there was a 650 CFM two barrel NASCAR version available.
                         
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                        • RandyB

                          RandyB Member

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                          I think the 2300 2 bbl will be great. I've heard a lot of good things when on a slant. I just need to figure out how to do it. I'm getting a lot of good information from other forums but still not sure. Kickdown linkage is a rod. Need a cable I'm thinking. But would like to keep this switch simple as I'm not a mechanic.
                           
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                          • Garrett Ellison

                            Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                            It’s a somewhat expensive option and I don’t care for the extra throttle pressure but the Bouchillion performance throttle valve cable kit may be a possible option.
                             
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                            • Killer6

                              Killer6 Well-Known Member

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                              BTW, that carb is really ~ 248cfm, at a "performance" manifold depression.....i.e. 1.5"Hg, vs. the 3.0"Hg that 2bbl is rated at. Calculate accordingly....................
                               
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                              • RandyB

                                RandyB Member

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                                I just looked at bouchillion. 170.00 usd. And it looks to me that JUST might be the way to go. Thank you
                                 
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                                • RandyB

                                  RandyB Member

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                                  The Holley 2300? 350 cfm? 2 barrel?
                                   
                                • Garrett Ellison

                                  Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                                  Yes. And the factory BBD is rated at 190cfm by Carter’s two barrel vacuum specs. Two barrels are rated at a higher vacuum depression than four barrels. It’s actually a little worse than that because every carb manufacturer has its own set vacuum levels for two and four barrel vacuum. The reasoning at the time was that an engine would never be capable of producing the same level of vacuum with a four barrel as with a two barrel. However, in performance usage, while a two barrel will ultimately become restrictive at a point, any additional vacuum the engine creates above the carburetor rating makes the actual flow numbers much higher. Restrictor plates are some proof of this, as dyno testing with mass air flow sensors show a 390 cfm Holley on a super speedway engine will still pass well north of 700 cfm without the restrictor plate in place. This isn’t saying that a two barrel is going to be at the same performance level as four barrel, not by a long shot! But an engine will still tend to pull close to its air requirement at its peak as long as too large of a restriction isn’t in place. I think that for 75% of the \6’s out there, a large two barrel and two barrel intake will match the performance of a four barrel with four barrel intake without near the complexity, but mostly from benefit of a two barrel intake’s smaller plenum volume boosting the torque in the fat part of the curve of most \6 builds.
                                   
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                                  • RandyB

                                    RandyB Member

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                                    Well that's a little much information for this old guy. But it sure shows you know your stuff! Thank you
                                     
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                                    • Garrett Ellison

                                      Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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                                      Almost gave the dreaded red X on that one, LOL! Not so much as knowing my stuff but more learning the hard way that more often times the mundane stuff works better than exotic stuff in most instances. It's all about the performance matched components.
                                       
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