How much HP can a 750 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. For what it is worth, it is possible to get the BSAC figure below 5 lbs/hp/hr.

What size carburetor do I need for 500 hp?

You need an 800cfm for 500hp. 2bbl engines are in getting into the mid to upper 400's now, but they are severly restricting the engines they are on. So...... yes a 750 can support 500hp, but it will be restricting it meaning a larger carb can make more hp on it.

How much horsepower does a bigger carburetor add?

Bigger carburetor alone will not give you any horsepower. But instead, if you also install bigger carburetor jets and a performance exhaust system, you could gain up to 15-20 horsepower.

How big of carburetor do I need?

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).

What happens if your carburetor is too big for your engine?

A carburetor that is too big will not be able to provide the fuel needed for the engine. This can cause a lack of power and poor performance.

Does Carb Size Matter—Engine Masters Preview Episode 44

How much hp can a 950 carb support?

Although way too small according to the CFM calculations presented earlier, a 950 Ultra HP can pass enough air to support more than 800 hp from a street/strip 572.

Is a 650 cfm carb to big for a 350?

600 or 650 would work. The quadrajets that come on stock 350's are 750's. I've experimented on sbc boat motors and went from 500-850 the smaller carb will accelerate out of the hole faster than a larger carb. The larger carb will give you more top end.

Is a 650 too small 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.

How do I know if my carburetor is too small?

If the carburetor is too small, it restricts airflow into the engine. The cylinder can't fill up all the way. This starves the engine and results in slow acceleration and a lack of top-end power. A larger displacement engine running at higher rpm will require more air and fuel.

What size carburetor do I need for a 355?

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).

What carburetor 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.

What is a 600 CFM carburetor?

A 600 CFM carb can work well with engines making 250-450 horsepower depending on the combination of parts and the RPM where it makes peak power.

How much horsepower does a Holley carb add?

But once we compared the overall power curves, we saw major increases just past peak torque including a solid 14 lb-ft of torque at 4,600 and as much as 17 hp at 5,400 rpm. But the best news is the average power increase of 12 lb-ft and 10 hp across the entire test range.

Can a carbureted engine be supercharged?

You can purchase Weiand supercharger kits and Holley carburetors from many aftermarket retailers, including Summit Racing. Trick Flow Specialties offers superchargers for carbureted engines featuring an MP122 blower that is compatible with many OE four-barrel carburetors.

Can a carbureted engine be converted to fuel injection?

A fuel injection conversion replaces a carburetor with a fuel injection system. There are fuel injection conversion kits that make the entire process very easy. Older cars have carburetors, but electronic fuel injection (EFI) offers greater fuel efficiency and improved performance.

What CFM do I need for 350?

Answer #1: 350 – 400 CFM per ton of HVAC capacity.

This answer of 350-400 cubic feet per minute for each 12,000 BTUs of AC cooling is optimal for the system to run efficiently while adequately cooling and dehumidifying the space. Residential systems range from 1.5 to 5.0 tons, or 18,000 to 60,000 BTUs.

How many CFM does a quadrajet flow?

Quadrajets can range anywhere in between 600 and 800 CFM. Most are rated 750 CFM or higher. Quadrajets are used by many GM street car enthusiasts; however, they are also disliked by just about as many.

What size carburetor do I need for a 327?

A 600cfm Holley with vacuum secondaries is the best way to go on a stock 327. When tuned properly it should give you 13-15mpg and all the performance a stock 327 can handle. As a matter of fact even the 365 horse 327 in 1965 used a Holley 2818 carb and it was a vacuum secondary 600 cfm carb.

What size carburetor do I need for a 351W?

Re: What Size Carb For A Stock 351W 2 BBL

If you already have a 750 on hand, go with it. If you are buying a carb new, get something a little smaller. Like 600 or so. Realistically, around 500 cfm is all you'd need with this combo.

What is a 3 circuit carburetor?

Three-circuit metering systems bypass the metering blocks by pulling fuel directly out of the fuel bowl and into the venturi. They are easily identified by pullover tubes that protrude into the venturi near the throttle plate. “The third circuit is essentially a pullover system,” Benoit said.