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Old 12-14-2007, 03:54 PM
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Dual Quad on a 283 SBC

I know that I will catch all kind of flack over this but I have a question that needs answering. I have a 283 SBC w/HP 305 heads (mildly ported) Comp Cam .501 lift, 1 5/8 Headers(Lake pipes). I came across a 2X4 manifold(Edelbrock C-26) and 2 - 1406(600 CFM) Edelbrock carbs. Yes I know that the carbs are to big CFM wise for the motor but I don't have the money to put on the right carbs. Using the progressive linkage I will not bring in the extra carb till way late in the RPM range. I want the 2 fours mostly for looks.
The 283 is in a 28 Ford coupe with a T-10 4 spd and 3.55 rear.

My question is does anyone have any idea as to the starting point to jet(set up) the carbs to run half way decent?

As I said I really can't afford(spelled broke)to put on the right carbs and need to work with what I have.

Thanks for any help/advice you can give.
Jerry

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Old 12-14-2007, 08:29 PM
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The big E(experience) plays here. put it together and see how it performs. It does sound like way to much volume for a 283 w305 heads. You might need to go with a restrictor plate then jet down for performance. I agree with you the looks will be impressive.
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Old 12-14-2007, 09:10 PM
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57 Corvettes came with 2x4s (optional) on a 283........they were 2 Rochester 4bbls. Can't hurt to try it.
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Old 12-15-2007, 03:36 AM
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-EDELBROCK CARBURETOR TECH INFORMATION-

You are correct in having the secondary carburetor come in later with progressive linkage. It will be streetable. The problem may be with WOT and the ability of engine efficiency to accept all the CFM of the two. It can be tuned, just be patient with it.
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Old 12-15-2007, 08:01 AM
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Use the progressive linkage, wire the choke open one the secondary carb, turn the idle screw out all the way on the secondary carb. Make sure the throttle blades are closed on the secondary carb at idle or you will loose vacuum. You should only need to tune the primary carb for your application and don't be surprised that the secondaries on the second carb never open up all the way. One other thing that is very important is make sure your fuel pump is up to the job of supplying two carbs, you don't want a lean condition at WOT. There is nothing better than the look factor of dual four carbs, people will always double look your engine and say something about it. As for the power factor on a street vehicle, a single quad will beat dual four carbs 9 out of 10 times.
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Old 12-15-2007, 08:13 AM
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Quote:
Originally Posted by poncho62
57 Corvettes came with 2x4s (optional) on a 283........they were 2 Rochester 4bbls. Can't hurt to try it.
It wasn't just the Corvettes either, the option was available on any Chevy.
Although not ideal, it should not be too hard to make this combination work. If you can, get some help tuning it from someone with a wide-band O2 set-up.
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Old 12-15-2007, 08:23 AM
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Why not just use a thin block off plate and only hook up one of the carbs. You'd still have the look you want , and easier tunability.
Just my thoughts on it......
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Old 12-15-2007, 09:09 PM
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Dual quads on a 283 SBC

Thanks for all the info especially the one about using restrictor plates, I didn't think about that. The restrictor plates and the block off plate for the second carb sounds like good alternatives if I get good and fed up and can't seem to get the carbs dialed in.
Thanks again - Jerry
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Old 12-17-2007, 02:50 PM
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Dual quad 283 SBC

I just was thinking about the restrictor plate idea for my dual quad, does anyone know what size restrictor plate(holes for the venturis) they use for NASCAR and where I can buy the restrictor plates? Or would making the holes in the plate the same size as a Holley 390 CFM carb do the job? If so does anyone know the size of the venturis on a Holley 390 CFM carb?
Thanks for all your help, it sure makes for food for thought.
Thanks - Jerry
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Old 12-17-2007, 03:39 PM
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I have made a call to a carb guru, as soon as I find out the correct size I'll pm you.
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