# What Carburetor For 454?

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

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 is the best carburetor for a big block Chevy?

Holley’s vacuum-secondary 850 (PN 0-80531) makes a good street carb for a Chevy big-block and can deliver the goods on a 750-horse engine if correctly used! Throughout this book, the theme is achieving the best from your Chevy big-block by getting everything just right.

## How big of carburetor do I need?

The right idea would be to proportion the carburetor to the engine’s volumetric potential (breathing ability). The formula for calculating how much CFM (cubic feet per minute) an engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456.

## Is 600 cfm carb big enough?

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.

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## 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.

## 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.

## How much horsepower will a 750 cfm carb support?

A 750DP on a 330hp-400hp 5.7 with a dual plane intake (performer rpm) is easy to tune and will make max power to boot.

## What is a 600 CFM carburetor?

A 600 CFM carburetor can be a great choice for a wide variety of engines. They can be a perfect match for a highly tuned race engine around 300 cubic inches all the way up to a street tuned big block.

## How do I know what CFM my carburetor is?

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.

## How do I know if my carburetor is rich or lean?

Q: How Do You Tell if a Carburetor Is Rich or Lean? A: One way to tell for sure is by “reading” the spark plugs. If the plug tip is white, the mixture is lean. If it’s brown or black, it’s rich.

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## Does a bigger carburetor mean more power?

The answer is no, not really. The amount of fuel that’s sucked into the carburetor is controlled by the carburetor jets. Installing a bigger carb is simply going to improve the power potential of your bike. You still have other things to worry about like improving air intake, exhaust flows and jets.

## 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.

## What size carb do I need for a 350?

A stock 350 Chevy may have a 600-cfm Carburetor. 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.

## What size carburetor do I need for a 383 stroker?

Carburetor For 383 Stroker recommends a 650 cfm carburetor. A 750 cfm carburetor will make the engine more powerful, but it is the largest that should be used unless the engine is being used for racing.

## What size carburetor do I need for a 360?

If the engine is mostly stock the 600 – 625 cfm should be fine. If the engine is hot rodded, and you race it, then a 750 cfm would give you slightly more power.