Done with my fitech, advise on carburetor.

[Remos69]

I have a slightly modified 351w, 300hp and torque ~350 atk crate motor. I have a fitech tbi fuel injecton sitting on top. I have replaced 3 injectors in the last 3 years, all stuck open. It looks like I'm going on my 4th. I wanted more reliability, response, and bit modern, but...........I going back to a carb. ATK's recommend carb is Quick Fuel 680cfm vacuum secondary electric choke #793-HR-680-VS. Wanted some input on their recommendation and some other possible alternatives. Not off roading, mostly a highway queen.


Edit: does anyone have experience with the quick fuel also?

 

[distended]

What about this?

Pro-Flo 4 EFI Traditional 4150-Style Kit #35950 For Ford SB Windsor 351

Edelbrock Pro-Flo 4 EFI System for Small-Block Ford 351W CID engines. The EFI System comes with a 4150-Style satin finish single plane intake manifold and 35 Lb/Hr injectors capable of 550 HP with 58 p.s.i. fuel pressure.

www.edelbrock.com

I know it's pricey but it's a manifold fuel injection.

 

[bax]

Holley 600 is one of my favorites

 

[BGBronco]

I just went from FiTech to Holley Sniper. Same issues you had and I couldn't find anyone to work on it in my area.

The jury is still out on the Sniper. The controller is better, and running pretty well overall right now but I've had a lot of RFI issues. Additionally, you have to be very selective about your air cleaner set up under a factory hood.

 

[okie4570]

Quadrajet if sticking with a 4 barrel. Gave up on the Edlebrock, couldn't be happier with the qjet off-road or on road. Been on the bronco for almost 10y iirc.

 

[BigBronco16]

Been running the Summit 8500 for several years now. Easy tune and always starts with a touch of the key. Believe they make a 600 or even bigger.

 

[nvrstuk]

Check out the 100 other threads on carbs on THIS site.

Qjet. Best throttle response. Why? The primaries are small so air/fuel velocity is increased.

Float design- your carb won't bog over bumps and painted white lines like the Holley will. This is why hte Qjet is the best off road carb there is. I've been doing this a long time.

Mileage- smaller primaries when you keep out of the secondaries means and really does equal better mileage.

Qjet. Most of us from the '70's, 80's, 90's and the last 20+ years have all tried the Holley's, Edelbrocks, Carters, U-name it carbs. Read up on them- well worth it. Okie said it right.

 

[56f100bbw]

my 76 bronco 5.0 runs perfect with a new 500 CFM Edelbrock throttle response is great. No hesitation starts soon as you hit the key. But my 77 bronco 302 original engine rebuilt ,
New 500 CFM Edelbrock not so good

 

[Madgyver]

I 2nd the QJet

 

[Vincen]

I second the Edelbrock 500CFM AVS carb. Has run flawlessly.

 

[EB70]

Check out the 100 other threads on carbs on THIS site.

Qjet. Best throttle response. Why? The primaries are small so air/fuel velocity is increased.

Float design- your carb won't bog over bumps and painted white lines like the Holley will. This is why hte Qjet is the best off road carb there is. I've been doing this a long time.

Mileage- smaller primaries when you keep out of the secondaries means and really does equal better mileage.

Qjet. Most of us from the '70's, 80's, 90's and the last 20+ years have all tried the Holley's, Edelbrocks, Carters, U-name it carbs. Read up on them- well worth it. Okie said it right.

I am guessing that a properly set up and driven Q jet will surpass the factory 2-barrel for MPG etc. if driven correctly? My next build I am going to run the Q jet.

 

[reamer]

Dump the whole Electronically controlled Carbs thing, they are not EFI.. Go with Edelbrock PRO-FLO4 thats what I did a year ago...

 

[Glass Pony]

Holley 600 is one of my favorites

That's what I am running on my 351w. Carburetors isn't my thing but I slapped it on, plumbed it up, It fired up, adjust curb idle screw, and I've been running it for the last 10 years. I guess even a blind squirrel gets an acorn once in a while.

 

[JSBX]

I have a mild built 351 W with about the same HP as yours and really like my Q Jet.

 

[okie4570]

That's what I am running on my 351w. Carburetors isn't my thing but I slapped it on, plumbed it up, It fired up, adjust curb idle screw, and I've been running it for the last 10 years. I guess even a blind squirrel gets an acorn once in a while.

Think there's something to be said about Holly success at sea level or close to sea level like you and Bax are? I know that can all be adjusted for but they're just pretty much cussed around here in all aspects, we're only about 1700'.

 

[omureebe]

While I like my FiTech, going through a number of both FiTech and my own problems w/ installation, either Ford EFI or that Edelbrock setup look pretty good. But like any product, outside of OEM, good luck on finding support in 5 years.

PS - stuck injectors.... usually grit holding them open and improved fuel filters help with that.

 

[rocknhorse76]

Hands down, the best carb I ever used on my Bronco was a Q-jet. But I’m running SEFI/EDIS now, and wouldn’t even dream of going back to a carb unless it was apocalypse time lol.

 

[Ol'Blue]

Another Qjet fan here. I tried the Holley Sniper when it first came out and after chasing RF interference issues among other things for months, I went back to my trusty Qjet. If I were to try EFI again it will be ProFlo.

 

[Broncobowsher]

If it has to be a carb, Q-jet is a really good choice. Like EFI, done correctly they run great. Or can be a basket case.

 

[SteveL]

Like nvrstuk said. Been thru the other carb options. Both broncos been running q-jets for years. If you go q-jet I would recommend a quality one from a reputable builder. I run the stage 2 from jet performance.