Hi here are my engine specs so far...

•350 bored .040 over with eagle stroker assembly = 385 cubes

•Comp XR282HR Cam specs:
Basic Operating RPM Range:2,200-5,800
Duration at 050 inch Lift:230 int./236 exh.
Advertised Duration:282 int./288 exh.
Valve Lift with Factory Rocker Arm Ratio:0.510 int./0.520 exh.
Lobe Separation (degrees):110

•AFR 195cc #1040 heads

Okay so I need some help on picking an intake and carb combo.
This motor is going into an '83 Camaro. It's going to be street driven. Not necessarily a daily driver, but retain good qualities for street driving. With that said, it will be driven hard sometimes

I'm thinking of using an edlebrock performer rpm intake. Good choice?

As for the carb, I intitialy wanted to do a 750 Holley. However do not know what specific model to look into or what features (like mech secondaries etc) to get.
However, after some thinking it would be kind of unique to reuse my quadrajet for this build. Is this possible? I read that they flow like 750cfm. The only problem with this so far i have though of is maybe exhausting all the fuel in the bowl while at WOT. That and ill have to use an adapter for use on the Eddie intake.
I am friends with the best carburetor guy. He can rebuild one of these and tune it in seconds. (My 80 K-20 pickup with 37s, 4.10s and a 350 gets 11 m to the gall all city after his tune)

I'm looking for efficiency however fuel economy is not the top concern, just has to be reasonable.

Please give any suggestions!

 

I'd go with an Edelbrock RPM Air-Gap intake and a 750 Demon (or Holley) with annular boosters.

No way I'd run a Q-Jet on that....you won't run it out of fuel, but they're just not too compatible with the duration of cam you're running. Don't get me wrong, it'll work...but not near as well as a DP carb. IMO....

 

How much of a difference would you say from the q-jet to the demon 750 hp wise?

I sort of figured this answer on the stock carb. Just didn't want to throw a Holley on it like everyone does (although prob for the right reasons)

What's the deal with annular boosters? Sorry for the ignorance. I am a carb noob haha

Oh and good looks repping the 83 Camaro!

 

Ttt

 

From what I know, only a little, annular boosters give you a bit more vacuum at low throttle openings which helps with idle etc if you have a hotter type of cam. Personally I would go with a Holley or Demon as suggested above with mechanical secondaries, even a 650 would work well and might give better throttle response, but either would work.

 

I doubt anyone can pinpoint any HP difference between any vacuum secondary type carb and a DP. There's so many variables that can affect everything else.

And yes, a 650 Demon would work fine too I'd think. In general, a smaller carb will give you a better vacuum signal at idle then a larger one, but you may lose a little breathing on the top end. Kind of a compromise. But it should idle smoother and leaner.

a good way to kinda "cheat" and go with a bigger carb is to go with annular boosters when you have a big overlap cam and low vacuum signal at idle. They tend to do a better job of separating the fuel into a finer mist.

-But there's always a comprimise...the annular boosters are larger and take up more space in each barrel...so you tend to lose a little CFM on the top end....but it'll still give you more CFM than a 650 would.

By saying this, I've never owned a annular booster carb, but have done some reading about them - and I've talked to others that have them. They love the things and claim tuning seems easier.

So - just my amatuer recommendation for the most "streetable" carb that'll still perform well on something like your 383...I'd personally choose a 750 annular carb - OR - a 650 with regular dogleg boosters ..both DP's...

If fuel economy is a big concern...you didn't build the engine right for that already.

EDIT: any others with experience step right in...I don't claim to be right on everything...I've learned most of my stuff the hard way.

 

Isn't a regular Q-Jet a 650 or 750 cfm anyway?

Heck a Q-jet off a older 455 is even bigger!

 

That's what I thought.

Do I need the a annular boosters? They seem to be x2 expensive as one without them. Is a non annualr booster carb going to be irresponsible off idle?

So I should get a carb with mechanical secondaries and a manual choke ?
Because my car is an automatic, is there any provisions I need to get for vacuum or something?

 

Oh....you should rebuild the Q-jet then....

 

Like seriously? Lol

I was gonna go the Holley or demon 750 route

 

http://m.summitracing.com/parts/hly-0-81770

Would this be a good choice?

 

I wouldn't, stick with mechanical secondaries unless you have a heavy vehicle or high gearing. Q-jets are a different story, they are not vacuum secondaries they are air-valve carburettors and respond to load so a seemingly large 750 will work on almost any size engine. A well tuned Holley, Quick Fuel, Demon type carb will suit your application.

 

I have never liked adapter plates. Whether spread bore to square, vice versa, or two barrel to four
You just never get the performance that you get with a matched carb and manifold.
Not to mention 2 gaskets instead of just one. And forget it if you end up using a spacer!

 

The carb you posted seems to be OK...I've never seen anyone use one of those however. Nothing says you can't use a vacuum secondary carb, but in general they're a bit less performance oriented. By looking at the setup you posted with those heads, that duration cam...I would still opt for a DP stye carb personally.

Also, the carb you posted is a square ore carb, so you won't need any adapters like you would if you use a spread ore Q-jet. It seems like you've spent good $$ so the engine will perform...don't cheap out on the carb...just saying...

 

A stock computer controlled QJet? No way.

A non-computer controlled QJet, properly tuned, absolutely.

They sell a Qjet version of the RPM intake so it will bolt up without adapters (and you can still use a Holley/squarebore carb on it as well if you change your mind later).

The QJet is probably the best dual-purpose street/strip carb ever built. I run one on my 383 stroker with a Weiand 142 blower on top. Minor tuning differences vs. running N/A but ask anyone I've given a ride in it and they'll tell you it runs like it's fuel injected. ZERO holes in the fuel curve. Responsive at any RPM or throttle position. I've lived with it for a long time so I know it like the back of my hand, but it's honestly not all that far from stock. If you get a "Stage 2" Qjet from any of the reputable builders you will have a near-clone of my carb.

Check out The Carb Shop in Ontario, California (not Canada). They turn out a quality product. They're not the only ones, but they are reputable. I've heard that Jet also makes a decent performance-tuned QJet as well.

 

This is reasurring. I already contacted the carb shop. I can get my hands on a non ccc q-jet easy. I already requested a quote. Thanks for the input. A q-jet just seems like a good design.

If this q-jet route doesn't work out for me, I'll be looking at a Holley or Demon carb, 750cfm, mechanical with annualr boosters.

Just a quck question, what is ford kick down? What attributes does a carb need for an auto as compared to a manual?

 

What auto trans are you running?

 

700R4

 

UPDATE

Just picked up this non computer controlled quadrajet today. It has electric choke and best of all it was free.

Going to call not The Carb Shop tomorrow and SMI Induction and decide who to let build this guy. They both offer similar "Stage 2" builds for a similar price (around $280).

I will document my dealings with who ever I choose and the performance of the carb on the motor. Hopefully this will turn out great and my experience could be used to prove the q-jet is a great street performance carb when set up right!

Any comments/suggestions?

BTW should I start a new thread on this?

 

That's the right kind of core to start with for a typical performance-oriented non-compter-controlled QJet application. Obviously it's a bit rough, but both of those shops should be able to bring it back to better-than-new condition, including a performance tune. Let us know how it turns out.

 

Okay I officialy sent it out a few days ago to SMI Induction. I am documenting my experience with them and the carb they build for me in this fourm if you guys are interested:
: )
https://www.thirdgen.org/forums/carb...ml#post5502972

P.s. thanks for all the input I learned a lot from this thread