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Old 08-11-2015, 02:30 PM
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Quadrajet or Holley?

I need a new carb for my Camaro. It's a built 350 with Vortec Heads and a LT4 Hot Cam. The motor should be around 400hp. Should I go with a QJET or a Holley? My dad said both work well and its my choice. Its a 5 speed and its a weekend fun car. I want good throttle response and decent gas mileage. My dad is a pro at tuning Holleys and ok at quadrajets. Any recommendations are useful. And if Holley, which one?








I don't know if it matters, but here are the cam specs LT4 Hot Cam Specs

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Old 08-11-2015, 04:07 PM
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Quote:
Originally Posted by MustangBeater20 View Post
I need a new carb for my Camaro. It's a built 350 with Vortec Heads and a LT4 Hot Cam. The motor should be around 400hp. Should I go with a QJET or a Holley? My dad said both work well and its my choice. Its a 5 speed and its a weekend fun car. I want good throttle response and decent gas mileage. My dad is a pro at tuning Holleys and ok at quadrajets. Any recommendations are useful. And if Holley, which one?








I don't know if it matters, but here are the cam specs LT4 Hot Cam Specs
This would like a 750 cfm carb, it is kind of take your pick but I'd lean toward the Holley as the Qjets are either rebuilds or New Old Stock (NOS). Edlebrock makes the old Carter AFB and AVS available new and Barry Grant's new Demon is a variation on that same theme. Summit makes the old Ford/Holley in a 750 it uses mostly Holley internals stuffed into a different body with annualr boost venturis which help mileage in these no metering rod carbs.

Bogie
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Old 08-11-2015, 04:32 PM
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Quote:
Originally Posted by oldbogie View Post
This would like a 750 cfm carb, it is kind of take your pick but I'd lean toward the Holley as the Qjets are either rebuilds or New Old Stock (NOS). Edlebrock makes the old Carter AFB and AVS available new and Barry Grant's new Demon is a variation on that same theme. Summit makes the old Ford/Holley in a 750 it uses mostly Holley internals stuffed into a different body with annualr boost venturis which help mileage in these no metering rod carbs.

Bogie
X2

The Qjet, if it was still available as a new aftermarket piece would be a great carb, but there are just too many clunks being rebuild - kinda.

Are you aware that if you have a Qjet intake, a Holley (or Edelbrock) is NOT a simple bolt on replacement with any adapter not being a great idea for performance
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Old 08-11-2015, 06:17 PM
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If you want mileage get the Q-jet. If you want to step up the power later I would get a 750 double pumper in Holley or equivalent
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Old 08-11-2015, 07:14 PM
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Is 750 CFM too much? I don't want stinky exhaust at an idle..
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Old 08-11-2015, 07:22 PM
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750 is not too much.Stinky exhaust is a tuning issue not a carb thats too big
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Old 08-11-2015, 09:34 PM
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I have been told a q-jet is a good carb provided it's rebuilt and tuned properly. Problem is I have never seen one that meets both criteria.

I vote for getting a carb that's made in the 21st century so that rules out a q-jet. Your experiences may be different from mine.
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Old 08-11-2015, 09:57 PM
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I would look at the Quick Fuel carbs, they are very tunable, all metering orifices are replaceable with screw in jets. Very useful for tuning.
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Old 08-12-2015, 01:12 AM
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I'll look into quick fuel.. I was actuallyabout to ask about them!
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Old 08-12-2015, 05:50 AM
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I put a Quick Fuel Slayer 750 on my 351C Mach 1 last year and I was very impressed. The best part is you can get a Brand New Slayer 750 CFM for $299 - $315 which is very reasonable.

Great Bang for the Buck

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Old 08-12-2015, 06:55 AM
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Quadrajet or Holley?

There are several carburetors to choose from. Look at a Quick Fuel 750 with mechanical secondary. Give them a call for which series to choose. You also have the Holley 750 https://www.holley.com/products/fuel...rts/0-80803RDX. Then you have AED's 750 Ho 750 http://www.summitracing.com/parts/ae...o-rd/overview/ or http://www.summitracing.com/parts/ae...m-rd/overview/. It is AED's version of the Holley XP. They modify it with custom jets, air bleeds, and power valves. It has a lot of extras for the price.

Last edited by cdminter59; 08-12-2015 at 07:08 AM.
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Old 08-12-2015, 08:30 AM
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I own both holley and quick fuel brand carbs and if your going to get a new holley style carb I recommend the quick fuel as you can adjust and tune everything on them and for the same price compared to a holley brand equivalent it would cost quite a bit more just to make a holley brand carb adjustable like the quick fuel.

The 750 vacuum secondary is just a little over $300 depending on where you buy it from and they are made a little more durable compared to holley brand.
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Old 08-12-2015, 12:53 PM
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I'm thinking about getting a mechanical secondary. I think it would work better with a stick.
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Old 08-12-2015, 01:58 PM
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I absolutely love a spread bore Q jet. That being said if they made new ones today that is the carburetor I would use on all of my street machines. The problem is like has been said. They are getting old and it is hard to find a real good one that hasn't been "Backyard Rebuilt" so many times they are plum wore out.

What I like about the Q jet and other spread bore carburetors is the small primaries and oil barrel sized secondaries. It makes good fuel mileage around town if you stay out of the skinny pedal. When you get into the secondaries it gives you nice seat of the pants boost. A small primary for your low end. You don't need 750 cfm at low rpm. When the engine starts coming into the cam you give it all it wants and the performance is impressive.
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Old 08-12-2015, 02:20 PM
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Quote:
Originally Posted by MustangBeater20 View Post
I need a new carb for my Camaro. It's a built 350 with Vortec Heads and a LT4 Hot Cam. The motor should be around 400hp. Should I go with a QJET or a Holley? My dad said both work well and its my choice. Its a 5 speed and its a weekend fun car. I want good throttle response and decent gas mileage. My dad is a pro at tuning Holleys and ok at quadrajets. Any recommendations are useful. And if Holley, which one?






I don't know if it matters, but here are the cam specs LT4 Hot Cam Specs

If you are looking for performance then go with the holley.If you want mileage go with the QJ.
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