HOLLEY 4781-3 Double Pumper Carburetor

( Brand: Holley ), ( Manufacturer Part Number: 4781-3 ), ( Type: Carburetor ), ( Mounting Flange Type: Square Bore ), ( Features: Progressive Linkage ), ( Material: Alloy ), ( Vintage Part: Yes )

Review HOLLEY List Double Pumper Carburetor fits 850

The Holley 4781-3 850 Double Pumper Carburetor is a high-performance fuel delivery system designed for serious automotive enthusiasts. This carburetor is part of Holley's Ultra HP series, which is known for its ability to deliver consistent and reliable fuel flow in even the most demanding applications.

At its core, the 4781-3 is a dual-feed, 850 CFM carburetor, meaning it can deliver a substantial amount of fuel to an engine for enhanced power and torque. The carburetor features Holley's legendary vacuum secondaries, which utilize a secondary circuit to provide additional fuel during high RPM operation, ensuring optimal engine performance.

The 4781-3 is constructed from high-quality materials, including a robust aluminum body and stainless steel float bowls. The primary and secondary jets are precision-machined from billet aluminum, ensuring accurate fuel delivery and long-lasting durability. The carburetor also includes Holley's unique "Full-Rise" design, which allows the secondary circuits to fully open at wide-open throttle, providing maximum power and performance.

This Holley carburetor is also equipped with a number of features that make it easy to install and tune for specific applications. For example, it includes a built-in fuel pressure regulator, which can be adjusted from the top of the carburetor without the need for additional plumbing. It also features independent idle circuits for each barrel, allowing for precise adjustment and fine-tuning.

Additionally, the 4781-3 is compatible with a wide range of fuel systems, including E85 and methanol, making it a versatile choice for a variety of applications. The carburetor also includes a number of optional accessories, such as electric choke and vacuum secondary kits, which can be added to customize the setup for specific vehicles.

In summary, the Holley 4781-3 850 Double Pumper Carburetor is a high-performance, versatile, and reliable fuel delivery system that is ideal for serious automotive enthusiasts. Its robust construction, precise fuel delivery, and ease of tuning make it a popular choice for high-performance applications, and its compatibility with a wide range of fuel systems makes it a versatile option for a variety of vehicles.

The Holley 4781-3 850 Double Pumper Carburetor is a popular choice among automotive enthusiasts for its ability to deliver reliable and consistent fuel delivery in high-performance applications. Here are some pros and cons that can help you make an informed decision about purchasing this carburetor:

1. High Flow Design: The Holley 4781-3 850 Double Pumper Carburetor is designed to provide high fuel flow rates, making it an excellent choice for high-performance applications.

2. Fuel Efficiency: Despite its high fuel flow capabilities, the carburetor is known for its fuel efficiency, which can help save money on fuel costs in the long run.

3. Adjustability: The carburetor offers a wide range of adjustability, allowing users to fine-tune the fuel mixture for optimal engine performance.

4. Durable Construction: The carburetor is built with heavy-duty materials, making it durable and able to withstand the demands of high-performance applications.

5. Easy Installation: The Holley 4781-3 850 Double Pumper Carburetor is relatively easy to install, making it a popular choice among DIY enthusiasts.

1. Complexity: The carburetor is known for its complexity, which can make it challenging to tune and maintain for some users.

2. Cost: The Holley 4781-3 850 Double Pumper Carburetor is more expensive than some other carburetor options on the market.

3. Fuel Pressure Requirements: The carburetor requires a higher fuel pressure than some other carburetors, which may require the use of a fuel pump or other accessories.

The Holley 4781-3 850 Double Pumper Carburetor is a high-performance carburetor that offers excellent fuel flow rates, fuel efficiency, adjustability, and durability. However, its complexity and higher cost may be a deterrent for some users. If you are looking for a reliable and consistent fuel delivery system for your high-performance application, the Holley 4781-3 850 Double Pumper Carburetor is an excellent choice.

If you are in the market for a high-performance carburetor and are willing to invest in a more complex and expensive option, the Holley 4781-3 850 Double Pumper Carburetor is an excellent choice. Its high fuel flow rates, fuel efficiency, adjustability, and durability make it a top pick among automotive enthusiasts. However, if you are looking for a simpler and more affordable option, there are other carburetor models on the market that may better suit your needs. Ultimately, the decision comes down to your specific application requirements and budget.

Details:

Have not opened it up, but the pump diaphragms are pliable, everything is clean and maintained, this guy took care of stuff I do recommend running without first rebuilding would be surprised if runs fine as. Holley 4781 850 double pumper from 1989 in excellent condition.

part #: 47813 prices

• $66.49-$69.95

specifications carbcoon:

• for models: 850
• brand: Holley
• mpn: 4781-3
• type: Carburetor
• mounting flange type: Square Bore
• features: Progressive Linkage
• material: Alloy
• vintage part: Yes

seller carbcoon:

• city: Minneapolis, Minnesota
• # reviews: 920
• rating: 100.0%

payments carbcoon:

• credit card: Visa
• other
• wallet: Google-pay

shipping carbcoon:

• carrier: USPS
• cost: $0.00
• type: Fixed
• transit: 2-6 Days
• class: Standard
• service: USPS Ground Advantage

offer carbcoon:

• options: Ship-to-home
• quantity: 1
• sold: 0
• started: October 21, 2025
• availability: In Stock

general carbcoon:

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

returns carbcoon:

• time: 14 Days
• policy: Returns Accepted
• paid by: Seller

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