Quick Answer: What Size Carburetor Do I Need For A Stock 454 Motorhome?

What size carb should I put on my 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 what size carburetor to get?

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 carbureted 454 have?

The 454 engine produced about 230 horsepower and 360 foot-lbs. of torque.

What happens if you run too big of a carburetor?

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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How much horsepower can a 850 cfm carb support?

I ran some numbers through my dyno software and it shows 850 being good for a touch over 1000hp with the right combo. RPM to CID ratio appears to be the big factor here, that is to say an efficient engine needs less carb per hp. That makes sense.

What is the difference between Holley 4150 and 4160?

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.

Is a 650 cfm carb to big for a 350?

If you’re expecting a maximum of 6,500 rpm, you’re going to need a 650- to 700-cfm carburetor. These sizing numbers are only the beginning of carburetor selection—a baseline. A 600-cfm carburetor may perform quite well on a stock 350 Chevy.

What can I spray in my carburetor to start my engine?

Photo 1: Give it a blast of fuel. 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.

Will a bigger carb make 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.

How much horsepower does a cam add to a 454?

The 454 responded very well to the cam upgrade, as the peak numbers jumped from 376 hp and 482 lb-ft with the stock cam to 428 hp and 507 lb-ft of torque. An increase of 52 hp is always welcome, especially when it comes with a sizable jump in peak torque.

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How can I get more horsepower out of my 454?

How Do I Get More Power out of a Chevy 454?

  1. Improve the fuel and air intake system.
  2. Replace the stock exhaust system with a high-flow system.
  3. Replace the stock timing parts with ones tuned for racing.
  4. Bolt on a supercharger.

Which Chevy big block is the best?

Our Top 5 Big Block Chevys of All Time

  • 396 L78. This is the original factory big block Mark IV engine from Chevrolet.
  • 427 Tri-Power. The 427 big block was introduced as a production engine in 1966 for full-sized Chevrolets and Corvettes.
  • 454 LS6.

What’s the best carb 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 does a carburetor spacer work?

So what does a carburetor spacer do? In a nutshell, adding a carburetor spacer increases the intake plenum volume by creating a taller neck on the manifold. With the extra volume, the distance between the floor (bottom of the intake manifold) and the bottom of the carburetor is also increased.

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