Considering a Summit 750

Fuel and Air Systems

  1. ToddMcF2002

    ToddMcF2002 Well-Known Member

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    I’ve always liked the smaller Summit carbs on other cars and the fact that you don’t spill fuel due to the bowl design changing jets etc and the annular boosters. Anyone running a Summit 750 with a 440? I’m running a stock cam, intake and a 727.

    573E7737-7B92-43EB-A120-3D92529DE864.jpeg
     
  2. Darter6

    Darter6 FBBO Gold Member FBBO Gold Member

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    Should be fine. I have friends that use them and are quite happy.
    Not a bad price too.
     
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    • GrabberOrange69

      GrabberOrange69 FBBO Gold Member FBBO Gold Member

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      I had the 600 vacuum version on a small block years ago. Daily driver, the carb was really smooth, good throttle response, mpg.

      I’d buy one again, but my daily drivers are all EFI now ;)
       
    • 1STMP

      1STMP FBBO Gold Member FBBO Gold Member

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      The Quick Fuel Slayer Series is a little easier
      to tune. 4 corner metering jets and secondaries
      adjusted with one screw. I run one on a 440
      and it works well.
      qft-sl-750-vs_xl.jpg
      Screenshot_20200705-034518~3.png
       
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      • RJRENTON

        RJRENTON FBBO Gold Member FBBO Gold Member

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        Sort of looks like a Holley 750 CFM carb.....not sure of the differences.....perhaps someone that owns/uses one can point out the differences between the Holley and the Summit design.....beside price.....China manufacturer??? Just curious....
        BOB RENTON
         
      • Darter6

        Darter6 FBBO Gold Member FBBO Gold Member

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        Much like the Ford Autolite 4 bbls from the 60's
        Well, just like them.
         
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        • RemCharger

          RemCharger Well-Known Member

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          Zoom in Bob. Not even remotely like a holley.
          I've never seen one, not sure why they exist yet.
           
        • GTX JOHN

          GTX JOHN Well-Known Member

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          We tested the 750 Summit:
          Very stable O2s and as much HP
          as Edelbrock 800. or Holley HP 750.
          Really Great underrated carh and very
          trouble free! It ran High 10's in 1/4. in our
          Pump Gas 440 in my 69 440 pump gas Street
          Car (Mopar Muscle Cover/Feature car)

          I would sell this Carb. ready to go in original
          Box and read to Go! $250.00
           
          Last edited: Nov 25, 2021
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          • RJRENTON

            RJRENTON FBBO Gold Member FBBO Gold Member

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            Not even remotely like the Ford-Motorcraft-Autolite carbs of the 60's. The Ford 1100 series 4 bbl carbs, had the secondary opening diaphragm assemnly at the secondary end of the carb and secondary opening vacuum source was an appendage that hung into the tight primary booster venturii measuring pressure drop for the opening signal; plus jets were in the floor of the fuel bowls; the entire air horn is removable without disconnecting the fuel line or removing the floats, without losing any fuel.
            The Summit carb shown in the first pix, ZOOMED IN, resembles a Holley with all the external attributes, adjustable floats, metering block, accelerstor pump assembly and lever, secondary opening diaphragm assemnly and choke....with the ONLY visable differences is the cast in Summit name and some scrolls on the body casting..... "copying is the sincerest form of flattery"........
            BOB RENTON
             
          • Photon440

            Photon440 FBBO Gold Member FBBO Gold Member

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            They are quite like the Ford Autolite 4100 series. The ones that Holley copied when they produced their own 4010 series. This is a continuation.
            Ford version:
            9%2bFROVryw&riu=http%3a%2f%2fwww.2040-parts.com%2f_content%2fitems%2fimages%2f73%2f1047973%2f001.jpg


            Holley version:
            t8LHhcNuhAPw&riu=http%3a%2f%2fwww.2040-parts.com%2f_content%2fitems%2fimages%2f88%2f386688%2f008.jpg

            Note the differences between these and regular Holley 4150/60 styles: no removable float bowls, removable top.
             
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            • RemCharger

              RemCharger Well-Known Member

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              Nailed it. Some kind of carb abortion.
               
            • RJRENTON

              RJRENTON FBBO Gold Member FBBO Gold Member

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              You are quite correct.....i misspoke re the Autolite Ford 1100. It is an 4100 series. The OPs first pix was the one I was responding to. My experience....the Ford/Autolite carb was just OK....it used a screw in replaceable main metering jet (like Holley) but larger screw size and overall larger size but had an ## F (F for Ford) designation and absolutely zero speed parts available. Jets were available thru Ford parts only.
              The Holley adaption of the Ford 4100 was poor at best but used Holley jets and could be tuned. Not sure if its still made...it used the Ford style of booster venturii. On my Father's 390 Galaxy 500, i replaced the Ford/Autolite 4100 with a Holley Model 4160 R-1850, jetted up a little....everything fit and looked OEM and no one was the wiser.....and ran significantly better.... Apologies for my innitial inaccuracy.
              BOB RENTON
               
            • ToddMcF2002

              ToddMcF2002 Well-Known Member

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              "carb abortion" that's a pretty obnoxious comment. Yes its based on the Autolite 4100 and on my Fords I've run them for years on small blocks without any drama. Its nice to be able to pull the tops off and not have fuel dump everywhere for a jet change. Uses all Holley jets and springs. The 600 comes stock with holley 68's. EDIT: and a 6.5 power valve
               
            • RemCharger

              RemCharger Well-Known Member

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              Sorry. But this IS a mopar site. :poke::lol:
               
            • ToddMcF2002

              ToddMcF2002 Well-Known Member

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              There is nothing Ford about this carb other than the old architecture heritage. How is this different than any other basic 4150 other than it has Annular boosters and won't mess up your intake? Same tuning options. Same power valves. Same vacuum secondary assemblies and springs, throttle design and choke assemblies. I haven't settled on the carb just looking to have an adult discussion about it.
               
            • Photon440

              Photon440 FBBO Gold Member FBBO Gold Member

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              It is different from the 4150 in that it doesn't have removable fuel bowls or metering blocks. There are no gaskets below the fuel line, nothing to leak. The Holley 4150 is cast zinc, this Summit carb is aluminum. When Holley first made it (4010 design) in the 1980s, they were working off the Ford design - because they had designed the Autolite 4100/2100 carbs that came out in 1957 for Ford in the first place.

              Nothing wrong with the carb, as said it now uses a lot of Holley interchange parts instead of the Autolite parts that were hard to find but it was never a good seller for Holley, people wanted the classic look instead. It wasn't used on cars OEM, manufacturers were switching to injection when this arrived, but I think a couple of Volvo Penta engines had it.

              The Summit version is popular with the Ford crowd to replace the Autolite on 60's Mustangs and Torinos in the same way that Mopar fans use Edelbrock replacements for old Carters.
               
            • ToddMcF2002

              ToddMcF2002 Well-Known Member

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              I really love that secondary adjustment. I had a 750 some years ago and did battle with the diaphram before knowing about the quick change kit and it was not pleasant - tore the diaphram. This is a step up from even that kit. Brilliant.
               
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              • rumblefish360

                rumblefish360 Well-Known Member

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                RJ, you mean the Quick Fuel carb vs Holley difference?

                The 4010?
                If directed to the 4010, I’m with grabber orange and GTX John. I’ll even echo grabber orange minus the move to FI. Abortion? That’s rough! LOL!
                 
              • ToddMcF2002

                ToddMcF2002 Well-Known Member

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                FI will never happen on my cars. I have too many friends who wasted their time and money adding needless complexity to their glorified throttle bodies. Most ripped it all out and went back to carbs or are stubborn and continue to suffer with stalling or surging cars and/or with dead Chinese sensors and side of the road adventures.
                 
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                • rumblefish360

                  rumblefish360 Well-Known Member

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                  I don’t care what the world says, you can’t beat a good well tuned carb!
                   
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