HOLLEY 4781-1 Carburetor Cfm Double Pumper

( Brand: Holley ), ( Manufacturer Part Number: 4781-1 ), ( Type: Carburetor ), ( Mounting Flange Type: Square Bore ), ( Vintage Part: Yes ), ( Country/region Of Manufacture: United States )

Review HOLLEY Carburetor Cfm Double Pumper fits 850

The Holley 4781-1 Carburetor is a powerful and highly efficient double pumper carburetor designed for high-performance applications. This carburetor boasts an impressive 850 CFM (cubic feet per minute) airflow rate, making it an excellent choice for high-powered engines that require ample fuel and air mixture for optimal performance.

The Holley 4781-1 Carburetor is equipped with a double pumper design, which means it has two vacuum pumps that help maintain a consistent fuel-air mixture under various engine loads. This design ensures that the engine receives the correct fuel-air mixture at all times, which is crucial for maintaining consistent power output and fuel efficiency.

The carburetor features a 750 CFM primary and a 100 CFM secondary, which allows for precise fuel delivery and tuning. The primary and secondary fuel bowls are separated by a vacuum diaphragm, which helps maintain a consistent fuel-air mixture even when the engine load changes.

The Holley 4781-1 Carburetor is designed with a high-quality aluminum construction, which is lightweight and durable. The carburetor is also equipped with a heavy-duty float bowl gasket and a billet aluminum fuel bowl, which helps reduce fuel leaks and ensure a consistent fuel supply.

The carburetor features a 1.75-inch primary venturi and a 1.25-inch secondary venturi, which allows for optimal fuel and air mixture. The carburetor is also equipped with a dual-feed fuel system, which ensures that the engine receives fuel from both the primary and secondary venturis, which helps reduce fuel starvation and ensure consistent performance.

The Holley 4781-1 Carburetor is equipped with a high-quality accelerator pump, which helps ensure that the engine receives sufficient fuel during acceleration. The carburetor also features a progressive linkage, which helps maintain a consistent throttle response even under heavy loads.

The Holley 4781-1 Carburetor is easy to install and tune, thanks to its comprehensive instruction manual and tuning guide. The carburetor is also equipped with adjustable idles and vacuum secondaries, which allows for precise tuning and fine-tuning of the fuel-air mixture to optimize engine performance.

Overall, the Holley 4781-1 Carburetor is a high-performance, double pumper carburetor that is designed for high-powered engines. Its 850 CFM airflow rate, double pumper design, and high-quality construction make it an excellent choice for anyone looking to upgrade their engine's fuel and air delivery system.

1. High CFM (Cubic Feet per Minute) rating: The Holley 4781-1 Carburetor has a CFM rating of 850, which is suitable for high-performance applications such as hot rods, muscle cars, and high-horsepower street machines.

2. Double Pumper Design: The double pumper design provides improved fuel delivery and vaporization, resulting in better engine performance and fuel efficiency.

3. Adjustable Main and Secondary Jetting: The carburetor has adjustable main and secondary jetting, allowing you to fine-tune the fuel mixture for optimal engine performance.

4. Billet Aluminum Construction: The billet aluminum construction of the carburetor is durable and lightweight, making it ideal for high-performance applications.

5. Flexible Air Bleeder System: The flexible air bleeder system makes it easy to bleed air from the carburetor, reducing the risk of fuel vapor lock and improving fuel delivery.

1. High Price: The Holley 4781-1 Carburetor is a high-end carburetor and comes with a high price tag. It may not be affordable for everyone.

2. Complexity: The carburetor is complex and may require specialized knowledge and tools to install and tune.

3. Requires Regular Maintenance: Carburetors require regular maintenance to ensure proper operation and fuel efficiency. This can be time-consuming and may require specialized knowledge.

4. Limited Fuel Options: The carburetor may not be compatible with all types of fuel, and may require modifications to work with certain fuels.

The Holley 4781-1 Carburetor (850 CFM Double Pumper) is a high-performance carburetor that delivers excellent fuel delivery and vaporization. However, it is a complex and expensive option that may require specialized knowledge and tools to install and tune. If you are looking for a high-performance carburetor for your hot rod, muscle car, or high-horsepower street machine, the Holley 4781-1 Carburetor may be a suitable option. However, you should consider your budget and technical abilities before making a purchase decision.

If you are a DIY enthusiast with experience in carburetor installation and tuning, the Holley 4781-1 Carburetor (850 CFM Double Pumper) may be a suitable option for you. However, if you are not confident in your abilities or have a limited budget, you may want to consider a less complex and more affordable carburetor option. It is always a good idea to research and compare different options before making a purchase decision to ensure that you are getting the best value for your money.

Details:

Put on Holbein injection in 1980 .Carb has been a box ever since. Ran the number right out of box. Very nice carb. One owner, I purchased in 1977 and used on my 8.90 index drag car.

All the numbers match and jets put back to original sizes.

part #: 47811 prices

• $66.49-$219.50

specifications carbcoon:

• for models: 850
• brand: Holley
• mpn: 4781-1
• type: Carburetor
• mounting flange type: Square Bore
• vintage part: Yes
• country/region of manufacture: United States

shipping carbcoon:

• carrier: FedEx, UPS
• type: Fixed
• class: Economy, Standard
• service: FedEx Ground Economy, FedEx Ground or FedEx Home Delivery, UPS Ground
• cost: $19.00
• transit: 5-10 Days

seller carbcoon:

• city: Davenport, Iowa
• # reviews: 5
• rating: 100.0%

returns carbcoon:

• policy: No Returns

payments carbcoon:

• credit card: Mastercard
• wallet: Paypal

general carbcoon:

• Car Truck Parts Accessories > Air Fuel Delivery > Carburetors
• condition: Remanufactured

offer carbcoon:

• started: June 13, 2024
• sold: 0
• availability: In Stock
• quantity: 1
• best offers: True
• options: Ship-to-home

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