What size carburetor do I need for a 350 Chevy?

Carburetor Size for a 350 Chevy
When determining the size of a carburetor needed for a 350 Chevy engine, it’s important to consider the engine’s displacement and expected RPM. The general formula for sizing a carburetor for a 350 Chevy is based on the engine’s displacement and RPM. According to the information found, the formula is as follows:
For a 350 by 5500 RPM:
– The result is 1,925,000, which is then divided by 3456 to give 557, calling for a 600 cfm carburetor.
For a maximum of 6500 RPM:
– A 650 to 700 cfm carburetor may be needed.
It’s important to note that the size and style of the carburetor can vary based on the specific needs of the vehicle, whether it’s for street performance or high-performance applications. Additionally, various brands offer different types of carburetors, each with its own sizing and style options.
When considering specific carburetor models, options like the Holley 0-80508S Street Avenger Carburetor and the Edelbrock 1406 Performer Carburetor are mentioned as suitable choices for a Chevy 350 engine, offering excellent airflow, fuel economy, and easy tuning.
In summary, the size of the carburetor needed for a 350 Chevy engine is determined by the engine’s displacement and expected RPM, with general recommendations pointing towards a 600 cfm carburetor for a 350 by 5500 RPM and a 650 to 700 cfm carburetor for a maximum of 6500 RPM. It’s also important to consider the specific needs of the vehicle, whether it’s for street performance or high-performance applications, when selecting a carburetor.

How much horsepower does a stock carbureted 350 have?

The horsepower output of a stock 350 engine also varies depending on the specific model, but can range from 145 to 370 horsepower.

What does adding a bigger carburetor do?

Putting bigger jets in a carburetor will allow more fuel to flow into the engine. This can be useful if you are trying to increase the power of your engine or if you are running your engine at high altitudes.

How much HP will a 750 CFM carb support?

As an example, a 750-cfm carb on one of my street/strip Chevy 383 small-blocks can make more than 600 streetable hp, whereas an engine less well spec’d may only make 540 to 550.

Is a 600 CFM carb too big for a 305?

600 isn’t too big for a 305. There’s not a whole lot of good to be said about Edelbrock carbs though, except that they’re cheap.

Is a 650 CFM carb to big for a 350?

650 CFM (any brand) will be fine for your car. Re: 600 or 650 cfm carburetor for a 350? Well the quadrajet has small primaries, and huge secondaries, so actually that would probably be best for a driver…… If you must go with an aftermarket carb, then i wouldn’t go any bigger than a 650…..

What happens if a carburetor is too big?

That’s a pretty big swing in cfm just by changing the rpm, so being realistic with your upper rpm number will help you pick the right carb the first time. If a carb is a little big you’ll be OK, but if it’s truly oversized you’ll have a sluggish throttle and the car will tend to bog.

Does a bigger carburetor mean more power?

Just remember; a smaller carb = quicker throttle response and lower RPM acceleration. A bigger carb means nothing more than better TOP-END acceleration. On a carb that is too big, everything below that peak operating RPM WILL suffer, meaning; your so called “Jack Rabbit” starts will be more like slow turtle starts.

How do I know what size carburetor to get?

To arrive at the most appropriate carburetor choice, there’s a basic formula: engine displacement multiplied by maximum rpm divided by 3,456. For example: a typical 355ci small-block—a 0.030-over rebuild—with a 6,000-rpm max engine speed would work well with a 616-cfm carb ((355 x 6,000) 3,456 = 616.32).

Do carburetors increase horsepower?

A larger carburetor can allow more air and fuel to enter the engine, which can increase horsepower. Install a high-performance camshaft: A camshaft with more lift and duration can increase the amount of air and fuel flowing into the engine, which can improve horsepower.

What CFM carburetor for 350?

A 600-cfm carburetor may perform quite well on a stock 350 Chevy. However, the minute you start weaving in power adders like a hotter cam, a dual-plane performance intake manifold, and aluminum heads you’re going to need 700-750 cfm.