FAQ: What Size Carburetor Do I Need For A 355?

What size carburetor do I need for a stock 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.

How do I choose the right size carburetor?

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 will a 650 cfm carb support?

So, using your Google-Fu you type “How much power can a 650 cfm carb support?” Well, 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.

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.

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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.

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 can I spray in my carburetor to start my engine?

Remove the air filter and shoot a one-second burst of an aerosol petroleum-based lubricant (not starting fluid, silicone or Teflon spray) directly into the carburetor throat. Try starting. If the engine starts and then dies, that confirms you’ve got a fuel problem.

How much is a carburetor rebuild kit?

How Much Does a Carburetor Rebuild Kit Cost? A carburetor rebuild kit usually costs around $50 to $250, depending on its brand and inclusions. Most rebuild kits are direct fit, so make sure to choose one that’s compatible with your vehicle.

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.

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How do you calculate CFM for carburetor?

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.

Will a bigger carb make my bike faster?

A bigger carburetor alone will not make your bike go faster. In most cases, your bike won’t even start or idle roughly with a carburetor that’s too big. For more power, you should look into a full system performance exhaust and rejetting your carb (not replacing it entirely).

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 you adjust a carburetor?

Here’s How To Adjust a Carburetor

  1. Remove the Engine Air Filter. The air cleaner and filter assembly must be removed for you to access the carburetor.
  2. Locate Adjustment Screws.
  3. (Optional): Hook up Vacuum Gauge.
  4. (Optional): Set Baseline.
  5. Warm the Engine Up.
  6. (Optional): Adjust Idle Speed Screw.
  7. Adjust the Air-Fuel Mixture.

Can I use any carburetor?

That’s because there is a wide variety of pod filters on the market to fit most any carburetor. If the carb you’re considering has a different size spigot than your current carb, you can always have an adapter ring machined by your local machine shop. Sometimes you can just use a different manifold adapter.

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