What size carburetor is correct for my engine?

The engine’s volumetric efficiency is a measurable value and with a correctly matched carburetor you will receive the best performance possible out of your engine. 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.

What size carb 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.

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 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.

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 do I know if my carburetor is too rich or lean?

Typical symptoms of a rich mixture are:

1. Poor fuel economy.
2. Sluggish acceleration.
3. Choke not needed from cold starts.
4. Sooty or black spark plugs.
5. Sooty or black muffler end pipes.
6. Strong smell of gasoline when the machine is at idle.
7. Uneven running (will often slow from regular idle rpms and then stop)

What kind of CARB do I need for 454?

Thanks! A stock 454 carb. will do nicely b/c it is a 750 Q-Jet! Get into the motor manuals that MAY be at your Public Library in the automotive section like Motor, Chiltons, Mitchell and hunt up what you need..

What kind of carburetor do I need for a 500 CFM engine?

Even with about a 10% cushion, a 500 CFM carburetor will handle this engine great. If you try this formula yourself, be honest with how much rpm the engine will see. You’d be better off with a carb smaller than needed rather than something oversized that can lead to poor drivability and performance.

What kind of CARB do I need for a 400 hp engine?

Here is what they learned. Edelbrock air gap dual plane intake. A better than average 400 HP street performance engine. The test was four Holley XP series carbs, 650, 750, 850 and 950 CFM. Now this series of dyno pulls was on the Westech Performance dyno.

How big does a 950 hp carb need to be?

Remember, a 950 HP isn’t as large as you might think. It’s basically a 750 main body with an 850 baseplate. Typically flows in the 830 cfm range. it’s a good compromoise between a 750 and a 850/1000HP.