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Old 04-29-2012, 02:13 PM
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Which carb and Manifold for 283

I have a stock 1959 283. I am considering a Eldebrock Performer manifold and a Holly. Any one have advice on which carb to use? Also can the stock 59 heads use that much CFM. How much CFM does my 2BBL have now.?

Thanks in Advance, JM

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Old 04-29-2012, 03:05 PM
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Quote:
Originally Posted by john 1463
I have a stock 1959 283. I am considering a Eldebrock Performer manifold and a Holly. Any one have advice on which carb to use? Also can the stock 59 heads use that much CFM. How much CFM does my 2BBL have now.?

Thanks in Advance, JM
Holley 390 CFM #8007
283 @ 5500 RPM @ 80% VE= 360.3 CFM
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Old 04-29-2012, 06:13 PM
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I don't recommend a Holley. I recommend a Rochester Quadrajet. Why is because the Quadrajet has small primaries that make for high velocity that quickly creates torque that helps small cubic inch engines like 283s to get the vehicle moving from a stop. If you look at the factory 2 barrel intake and carb on 283s, 305s, 267s, 262s and 307s you'll notice the carb has real small butterflies and the intakes runners are considerably smaller. This, combined with the small valves that came in these engines was designed to create sensitive low end throttle response due to the high velocity. As said the high velocity quickly created torque and helped the small cube engines to get the heavy vehicles out of the hole without placing the engine in a lug that could lead to detonation problems. Now when your cruising down the road with your 283 humming along you can kick it to the floor with the Q-jet and the massive secondaries will come in and provide all the flow your engine can handle. The Q-jet is a "air dam" carb, meaning it flows what the engine demands so it doesn't under or over carburate. This is why Q-jets came on so many different engines from the lowly V6 all the way up to monster caddy 500 cubic inch V8's.
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Old 04-29-2012, 09:10 PM
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I agree about the size of the primary. It depend which one is cheaper. Both carbs are good. 390 Holley has very small primary like the Q jet. If the intake is spreadbore pattern then use a Q jet. If it's square bore pattern the a Holley 390 # 8007.
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