HOLLEY MB4781 Carburetor Body Cfm Double Pumper Carb Racing 4150 4-BARREL

( Brand: Holley ), ( Type: Carburetor ), ( Manufacturer Part Number: MB4781 ), ( Country Of Origin: United States )

Review HOLLEY 4150 4-barrel 4781 Carburetor Main Body Cfm Double Pumper Carb Racing fits 850

The Holley MB4781 4150 4-barrel carburetor body, model number 850 CFM Double Pumper Carburetor, is a high-performance racing carburetor engineered to deliver exceptional power and fuel efficiency for enthusiasts who demand the best. This carburetor body is part of Holley's renowned 4150 series and is suitable for use with 4-barrel intake manifolds.

The MB4781 features a double pumper design, which utilizes two vacuum secondary circuits to provide a more consistent fuel delivery under varying vacuum conditions. This design is particularly beneficial for high-performance applications where power output and throttle response are critical. The 850 CFM flow rate is ideal for larger displacement engines, ensuring ample fuel supply for efficient combustion and increased horsepower.

The Holley MB4781 4150 4-barrel carburetor body is meticulously crafted from high-quality materials, ensuring durability and reliability. The body is designed with a precise bore size and finish, ensuring optimal fuel flow and atomization. The carburetor also includes a built-in fuel pressure regulator, allowing for easy adjustment of fuel pressure to optimize engine performance.

The MB4781 is suitable for use with a wide range of fuels, including gasoline and methanol, making it a versatile choice for racers and enthusiasts alike. The carburetor body also includes a removable float bowl gasket, allowing for easy maintenance and customization.

Holley's MB4781 4150 4-barrel carburetor body is a must-have for serious racers and performance enthusiasts who demand the highest level of power and efficiency from their engine. With its robust double pumper design, versatile fuel compatibility, and precise flow rate, this carburetor body is a reliable and effective solution for maximizing engine performance.

The Holley MB4781 4150 4-barrel 4781 carburetor body is a high-performance racing carburetor with a double pumper design and a flow rate of 850 CFM. Here are some pros and cons of buying this carburetor:

1. High Flow Rate: The 850 CFM flow rate makes this carburetor suitable for high-performance applications and racing.

2. Double Pumper Design: The double pumper design provides better vacuum secondary operation, which improves low-end torque and mid-range power.

3. Versatile Applications: This carburetor is suitable for a wide range of applications, including street rods, muscle cars, and racing vehicles.

4. Excellent Build Quality: Holley carburetors are known for their excellent build quality, and the MB4781 is no exception. It is made from high-quality materials and is designed to withstand the rigors of racing.

5. Easy to Tune: Holley carburetors are known for their ease of tuning, and the MB4781 is no different. It comes with a number of adjustable features, including primary and secondary idle mixtures, power valve adjustment, and more.

1. Expensive: The Holley MB4781 is a high-performance racing carburetor, and as such, it comes with a premium price tag.

2. Complexity: This carburetor is more complex than a standard carburetor, which means it may require more time and expertise to install and tune.

3. Requires Special Fuel Systems: This carburetor requires a special fuel system, including a fuel pump and fuel pressure regulator, which can add to the cost and complexity of the installation.

The Holley MB4781 4150 4-barrel 4781 carburetor body is a high-performance racing carburetor with a number of advantages, including a high flow rate, double pumper design, versatile applications, excellent build quality, and ease of tuning. However, it also has some disadvantages, such as a premium price tag, complexity, and the requirement for a special fuel system.

If you're looking for a high-performance racing carburetor and have the expertise and budget for it, the Holley MB4781 is an excellent choice. It offers excellent power and torque, and its build quality and ease of tuning make it a popular choice among racers. However, if you're on a budget or looking for a simpler carburetor for a street application, there are other options available that may be more suitable for your needs.

part # mb4781 prices

• $27.50-$75.00

specifications carbcaddie:

• for models: 850
• brand: Holley
• type: Carburetor
• manufacturer part number: MB4781
• country of origin: United States

payments carbcaddie:

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• credit card: Discover

shipping carbcaddie:

• cost: $0.00
• transit: 4-10 Days
• type: Calculated
• carrier: USPS
• class: Standard
• service: USPS Ground Advantage

seller carbcaddie:

• # reviews: 34822
• rating: 100.0%

returns carbcaddie:

• policy: Returns Accepted
• time: 30 Days
• paid by: Buyer

general carbcaddie:

• condition: For parts or not working
• Car Truck Parts Accessories > Air Fuel Delivery > Carburetor Parts

offer carbcaddie:

• started: May 30, 2026
• sold: 0
• availability: In Stock
• quantity: 1
• options: Ship-to-home
• best offers: True

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