# What Carburetor For 461 Big Block Chevy?

## What size carburetor do I need for a 454 Chevy?

Because the 454 is less efficient, it doesn’t need as much cfm, so a 750cfm carb would be fine while a 650 cfm carb would be too small.

## What cfm carb do I need?

How to calculate Carburetor CFM. The formula for calculating how much CFM (cubic feet per minute) your engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456. Any ordinary stock engine will have a volumetric efficiency of about 80%.

## What is the most reliable carburetor?

Out of 13 brands of carburetors, enthusiasts elected Advanced Engine Design (AED), Edelbrock, and Holley (in alphabetical order) as the top 3 most reliable brands of carburetors.

## What happens if your carburetor is too big?

If the barrels are too big, the loss of air velocity means the cylinder will not fill to its full capacity. An engine with a carb that is too big will put out less Torque and Horsepower. It will be difficult to drive due to poor low-end torque. If you drag race your car, an oversized carb will produce slow 60 ft.

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## What cfm carb do I need for a 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.

## Are carb spacers worth it?

Spacers are said to improve air/fuel vaporization through and out of the carburetor. Anytime the air/fuel charge has to turn sharply coming off the carb, it increases the chance of separating the fuel from the air.

## How do I choose a carburetor size?

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).

## How much horsepower does a carburetor add?

After you fix what’s limiting performance, an Edelbrock Performer intake can add as much as 10 HP. The FAQ forum is a good place to ask questions. There are differences between engines and performance improvements.

## Can a carburetor be to big?

Not too big because youll lose driveability. Not too small or the carb becomes a major bottleneck. For most hot, dual-purpose cars, pulling about 1.0-inch-Hg manifold vacuum at WOT, max rpm on the dyno isnt far off.

## What is the difference between a Holley 4150 and 4160 carburetor?

These two are very similar with the primary difference that the 4150 uses a thick metering block in both the primary and secondary while the 4160 is shorter in length and uses a thin, metering plate on the secondary side.

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## Does Holley make a 750 spread bore carburetor?

Holley Ultra Double Pumper 750 cfm Spread Bore 4BBL Carburetor.

## What’s the best carburetor for performance?

Best Sellers in Automotive Performance Carburetors

1. #1. Spectre Performance 5776 1″ Open Carb Spacer with Tube.
2. #2. Edelbrock 9905 Performer 600 CFM Manual Choke Remanufactured Carburetor.
3. #3. Proform 141-200 69-91 SBC Timing Tab – 6.75/7.00 Balancer.
4. #4. Edelbrock 8711 Phenolic Carburetor Spacer, Black.
5. #5.
6. #6.
7. #7.
8. #8.

## Who makes the Demon carburetor?

Demon – Holley Performance Products.

## What is a down leg booster?

venturi inside the larger one and called it a booster, since it boosts the pressure drop. The booster is used to increase the “signal” or pressure differential especially at lower engine speeds to help move calibrated amounts of fuel from the float bowl into the engine.