What Size Carburetor Do I Need for a 350 Chevy? For this question I would say, The Right Carburetor Will Make a Huge Difference in the Performance of Your Engine.
To determine the size of a carburetor you need for your 350 Chevy, you can’t use simple math. Don’t even think about the product description specs—those numbers are never accurate.
The first thing to do is figure out what performance goals you have for the car. That means considering what modifications you’ll make, what cam you plan to use, and how much power you want to make.
Best Carburetors for a 350 chevy
Here is a list of our top Chevy 350 engine carbohydrates:
Rochester Quadrojet Stage 2 Carburetor JET 35002.
- Includes all features of Stage 1 Q-jet
- Offers improved idle quality as well as instant throttle response
- Offers maximum torque and horsepower
- Consists of high speed circuits. Four barrel
Edelbrook 1406 Performer 4 Barrel Carburetor.
- Designed and calibrated for optimum marine performance
- Single feed fuel inlet with air valve secondary type
- Shiny silver finish and calibrated for gasoline
- Electric choke with 4-barrel square bore carburetor flange
Holly 2300 0-7448 2-barrel carburetor.
- Fit type: Vehicle Specific
Rochester 2GC 2 barrel carburetor.
- Brand New Aftermarket Carburetor Replace For Rochester 2GC 2...
- Carbuertor Fits for Engine Models 350/5.7L 1970-1980 and 400/6.6L...
- Kindly note: The Oil Channels of Carburetors will be Blocked...
- Fits for 1980-1980 B60 1970-1975 Bel Air 1970-1972 Biscayne...
What Size Carburetor Do I Need for a 350 Chevy?
A 600-cfm carburetor works well on a stock 350 ear. However, you will need 700-750 cfm the minute you start weaving in power adders such as Hotcom, Dual-Plane Performance Manifold, and Aluminum Heads.
How do I know what size carburetor I need?
The simple formula for calculating how much CFM (cubic feet) does an engine need is: CFM = cubic inches x RPM x Volumetric Efficiency ÷ 3456. Any typical stock engine has about 80% volumetric capacity.
These basic principles are close to the size of an engine carburetor but do not nail to the head. As a result, we need to take this formula one step further.
Start with the estimated VE, which is always open to discussion depending on how radical the engine is.
To make the most of VE, we need to look at the intake manifold, naturally aspirated or forced impulse, cylinder head design, carburetor, cam profile, and bore/stroke dimensions.
When we have the baseline numbers, we need to select not only the size (cfm) carburetor you need, but also the following metrics.
- Vacuum or mechanical secondary.
- Single or double pumper.
- Being choked or not choking.
- Interchangeable airs bleeds or are constant.
- Single or dual metering block.
Finally, how compatible the carburetor is with your throttle and automatic transmission kick-down linkages.
When it comes to choosing carburetor brands, all manufacturers bring something good to the table.
You need to decide which brand works best for you. See design features, tuning capability, flexibility, and how the carburetor relates to your engine, vehicle, and driving habits.
How much horsepower can a 650 CFM carburetor support?
The chances are that you’ll get answers in the 450-470 hp range, but that’s not really the right way to look at it. In fact, horsepower—or even torque, for that matter—doesn’t matter at all.
We know that horsepower and torque decrease with changes in elevation and we also know that there is no change in elevation during a drag race starting from a dead stop.
Carb Size Manifold Walk Horsepower
|Holly 650||1.8 470.4|
|Holly 750||1.5 477.15|
|Holly 850||0.5 474.3|
|Holly 950||0.4 471.5|