Carburetor Choice / Please Vote / Assistance Requested

[GoDadGo]

Hey Gang,

I'm nearing the Go-Kart stage and need to order my Carburetor.
Originally I was going to get the Quick Fuel 780 Vacuum Secondary, but am looking hard at the Edelbrock AVS-800.
Both carbs have Pros & Cons, but I'm now leaning towards the Edelbrock piece.
Please vote your mind no matter what party you are affiliated with!
Everything is set up to run between 2,300 - 6,500 RPM's.
Thanks-N-Advance!

Steve >> aka: GoDadGo

1. 383 Small Block Chevy 9.7-1 Pump Gas Friendly Compression Ratio!
2. Eagle Internally Balanced Rotating Assembly With 6" H-Beam Rods With Floating Forged Flat Tops.
3. Dart Iron Eagle 215 CC Heads with 2.05 Intake & 1.60 Exhaust Valves.
4. Harland Sharp Roller Rockers & Other Go Fast Goodies.
5. Comp Cam Extreme Energy 284 Hydraulic Flat Tappet Cam
6. Weiand 7530 Team G Single Plane Manifold.

[wallace18]

I think that is too much carb for the street. A 650-680 carb would work best IMO. But the FITech FI is so much better than a carb IMO and cost is so close why not go with FI. You will have so much better drivability and power. Just food for thought.

[Gordon Levy]

quickfuel SS series 750

[edwardb]

quickfuel SS series 750

Agreed. Anything Quickfuel is good. I've had both the SS-650 and SS-750. Fantastic carbs.

Both widely debated, but (1) Not a fan of vacuum secondary carbs on these cars. Been there done that. Light, highly powered, manual trans. All not a good combination. People select them sometimes because they're supposedly easy to tune. Not my experience at all. Double pumper all the way for me. (2) Many examples of Edelbrock's not being the best choice for these cars either.

[Jsf74]

Quick fuel on everything I own!!!! 750 will work nice on a 383

[AC Bill]

Streetmaster Rochester Quadrajet 4-bbl 750cfm Stage 3

Fully modified Quadrajet with oversized .149 needle and seat assembly. Main well size is increased and balanced to assure proper top end, high RPM fuel flow. Extensive circuit modifications are performed to keep the fuel curve correct throughout the RPM range, clean idle quality, and instant off the line response.

Made for Chevy's :)

[Polecat]

Weber 48IDA 2X4. You must have accidentally left these off the list ;)

[Bren]

I have a quickfuel double pumper and I love it. So, that's what I would recommend.

[Gumball]

Weber 48IDA 2X4. You must have accidentally left these off the list ;)

Sexy, sexy.........

http://i845.photobucket.com/albums/ab15/CCRsAC/sbford_zpscwioew7s.jpg (http://s845.photobucket.com/user/CCRsAC/media/sbford_zpscwioew7s.jpg.html)


or there's always tri-power.....

http://i845.photobucket.com/albums/ab15/CCRsAC/IMG_2405.jpg (http://s845.photobucket.com/user/CCRsAC/media/IMG_2405.jpg.html)

[NAZ]

There are as many choices as opinions. I calculated the theoretical airflow requirements for your engine and assuming 80% VE, it should flow 579 CFM. When sizing carbs to engine airflow you need to apply a correction factor to arrive at the proper carb CFM rate. Four barrel carbs are typically rated at 1.5" manifold vacuum at full open throttle. So if a typical street engine pulls .8" - 1" at full throttle you need a 750 CFM carb. Yes you may get a bit more low end throttle response with a 650 CFM but it will fall off at higher speed. In such a light car I'd not even consider a vacuum secondary carb -- go with a 4150 double pumper style. And Quick Fuel makes the most adjustable carb in that category. At your altitude the out of the box carb will be close but purchase extra jets and plan to tune regardless of the carb you purchase. I doubt you'll need to change the power valve at that altitude but don't rule it out as your cam profile may dictate a change. The other tuning items you'll want to purchase are accelerator pump cams. Good luck and have fun.

[RoadRacer]

Holley 650 double pumper.

[GoDadGo]

Hey Gang,

Please know that I'm running a Weiand #7530 single plane intake.
It's square flange set up and the only manifold with an RPM range low enough that actually fits the High Port Dart Heads.
Again, everything is set up to run between 2,300 - 6,500 RPM's so please keep your opinions coming.
I'll be making my decision later tonight so please CHIME, CHIME, CHIME in if you have an opinion!

Steve

[ProJoe]

FITech FI is so much better than a carb IMO and cost is so close why not go with FI.

isnt the FITech stuff 2-3x the cost of a carb?

[Gordon Levy]

Good carb is about $675 and FITECH is around $1200

[GoDadGo]

Good carb is about $675 and FITECH is around $1200

Do you have any thoughts on the new Holley Sniper System that just came out?

[first time builder]

Quick fuel 750 would be perfect ! You might have to change the power valve , but that would be with and Holley type Carb. I have an Edelbrock 600 on my 350 Vette and its great never a Bowl leak or seep. Probably could have gone a little bigger but its purely a street car. But for true performance, (after many years a Holley fan) I love the Quick fuel SS carbs.
Kenny

[Rob427]

4150 style, 750 double pumper for sure in a light Cobra, with 383 cu in turning 6500 rpm. The 650 will not be enough in the high RPM.

[Rob427]

Gordon why the Quickfuel over the Holley. I'm a bit old school maybe.

Robert

[edwardb]

Gordon why the Quickfuel over the Holley. I'm a bit old school maybe.

Robert

Gordon likely will answer as well, but my comments... Quickfuel carbs are very similar to Holley. They tune the same, come apart the same, mount the same, etc. Some parts are even interchangeable. In general though made from higher quality materials and nearly everything is tuneable with screw-in jets, bleeders, etc. In some cases where it's only possible to drill out on a Holley. Aluminum carb body, machined aluminum metering blocks, just to name a couple differences. There are higher end Holley carbs that are perhaps comparable. But dollar for dollar, the Quickfuels are a better choice. I've had both. Think Holley on steroids. The company was started by former Holley guys back in the day.

[Gordon Levy]

The QF carbs seem to have a really nice quality about them, The Holley's have had some issues over the years, mostly for going from one venture capital owner to another. The street/pro and the pro series from Holley are good carbs but dollar for dollar the QF is a better carb.

[GoDadGo]

Gentlemen,

I want to thank you all for your thoughts and comments.
They are all appreciated!

Steve

[CraigS]

When I finally took everyone's suggestion and installed a QF SS650AN in place of a Demon 650 vac secondary carb it felt like I picked up 40hp in the mid range. My QF was far from being properly jetted out of the box. It was pig rich at full throttle and lean at 55 mph cruise. So I learned a ton about jetting a 4bbl carb over the next 3-4 months and bought a ton of jets. I didn't mind as I enjoy tinkering and learned. Just thought I'd throw that in if you maybe are considering a FiTech efi. The jets plus the wide band O2 sensor I needed put me over that $1200 that Gordon mentioned.

[GoDadGo]

When I finally took everyone's suggestion and installed a QF SS650AN in place of a Demon 650 vac secondary carb it felt like I picked up 40hp in the mid range. My QF was far from being properly jetted out of the box. It was pig rich at full throttle and lean at 55 mph cruise. So I learned a ton about jetting a 4bbl carb over the next 3-4 months and bought a ton of jets. I didn't mind as I enjoy tinkering and learned. Just thought I'd throw that in if you maybe are considering a FiTech efi. The jets plus the wide band O2 sensor I needed put me over that $1200 that Gordon mentioned.

CraigS,

What's the specs on your 408-W from a bore, stroke, compression, cam and intake style?
Also, what is your operation range because I'm now doing a deep dive into the FITECH-EFI system.

Steve

[Gordon Levy]

I am a FITECH dealer

[GoDadGo]

I am a FITECH dealer

Gordon,

Good Information To Know!
If I go down that path, you will be the 1st person I call.

Steve

[Hottrodder427]

I don't think efi will look right in my fe. I do want a three Duce though

[GoDadGo]

I don't think efi will look right in my fe. I do want a three Duce though

Good, then save that Holley for me when you get your 6-Pack!
Problems Solved!

[Hottrodder427]

As soon as I get it!!