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has any one ever put 2 carbs on a 350 ? and will it make more hp?

It all depends on the motor itself. The only reason to install 2 carbs is if the motor needs 2 carbs. If the motor is stock and the original carb is a 2bbl, it would be smoother to go with a new intake and a 4 bbl carb. That's a quick way to gain more power. The 4 bbl will have to meet the c.f.m. requirements that the motor can handle. Installing 2 ea. 2 bbl carbs would be trick looking and all but finding a dual carb intake might be hard to do. Also getting both carbs to work uniformly will keep you busy. A dual 4 bbl setup usually is found on engines with forced induction (Blowers and such). It comes down to the c.f.m. requirements of the motor. If there's too much carburation for the application, you'll lose power, it will not function smoothly and you'll waste fuel. Just adding another carb to the motor will not help.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

you can put two 390 CFM holleys or you can jet down two 450's to run on a 350. I have even see two 600's on a stock 350. I personally think that unless the motor is built up a lot then it's more for looks. You can get the job done with a single carb.

Tunnel ram intakes usually operate in the 3-10K rpm range and prefer WOT so its not really practical to put them on a stock or near stock 350

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1978 LUV Truck 2WD
450 "Small Block" Chevy
3.70 Ford 9
28x10 Goodyears

What do you guys think of the Demon carb, and the carters?