HOLLEY LIST4781 Holly Double Pumper

( Brand: Holley ), ( Manufacturer Part Number: LIST4781 ), ( Choke Type: Mechanical ), ( Type: Carburetor ), ( Mounting Flange Type: Square Bore ), ( Oe/oem Part Number: Chevelle Mustang Gto Gran Sport ), ( Material: Alloy ), ( Country/region Of Manufacture: United States ), ( Vintage Part: Yes )

Review HOLLEY Holly Double Pumper fits 850

Introducing the Holley 4-1100 Dominator Series Double Pumper Fuel Injection System, model number LS-850-DB-FI, also known as the Holley List 4781. This high-performance fuel injection system is designed for applications requiring increased fuel delivery, making it an excellent choice for performance enthusiasts, hot rodders, and racing professionals.

The Holley 4-1100 Dominator Series Double Pumper Fuel Injection System features a unique design with two independent pumps, each capable of delivering up to 1100 CFM. This dual-pump configuration ensures reliable fuel delivery under all conditions, even during high RPMs or under heavy load. Each pump is equipped with a large 1.66-inch diameter plunger, which provides excellent fuel atomization and efficient combustion.

The fuel pressure regulator is integrated into the fuel pump housing, making installation easier and more convenient. The regulator is adjustable from 3 to 100 PSI, allowing you to fine-tune the fuel pressure to your specific engine requirements. The system also includes a built-in fuel pressure relief valve that prevents fuel pressure spikes and protects against fuel system damage.

The Holley 4-1100 Dominator Series Double Pumper Fuel Injection System is compatible with both gasoline and methanol fuel, making it a versatile option for a wide range of applications. The system is also designed to work with Holley's EFI management systems, including the Holley EFI AVS ECU, Holley EFI Sniper EFI, and Holley EFI HP ECU.

The system includes a wiring harness, fuel pressure regulator, fuel pressure relief valve, and all necessary hardware for installation. The wiring harness is fully labeled and color-coded for easy identification and installation. The system is also compatible with most popular fuel tanks and fuel filters.

In summary, the Holley 4-1100 Dominator Series Double Pumper Fuel Injection System, model number LS-850-DB-FI, is a high-performance, versatile fuel injection system designed for applications requiring increased fuel delivery. Its unique dual-pump design ensures reliable fuel delivery under all conditions, while its adjustable fuel pressure regulator and compatibility with various Holley EFI management systems make it a popular choice among performance enthusiasts and racing professionals.

The Holley 4781 Holley 850 Double Pumper is a popular carburetor among automotive enthusiasts for muscle cars and hot rods. Here are some pros and cons to help you make an informed decision about purchasing this particular model:

1. High Flow Rate: The Holley 850 Double Pumper carburetor has a high flow rate, making it suitable for high-performance applications. It can support up to 850 CFM, allowing for increased horsepower and torque.

2. Fuel Efficiency: The Holley 850 Double Pumper offers improved fuel efficiency compared to other high-performance carburetors. Its secondary circuit helps ensure proper fuel mixture at all engine speeds, reducing fuel waste.

3. Adjustability: This carburetor offers easy adjustability for various engine conditions, with primary and secondary circulating fuel metering jets, as well as accelerator pump and power valve adjustments.

4. Durability: Holley carburetors are known for their durability. The 4781 model features a cast aluminum base, which helps dissipate heat and protect against corrosion.

5. Versatility: The Holley 850 Double Pumper can be used in various applications, including gasoline and alcohol-fueled engines.

1. Complexity: Compared to simpler single-barrel carburetors, the Holley 850 Double Pumper is more complex, which can make it more difficult to tune and adjust.

2. Cost: This carburetor is more expensive than some other models due to its high performance capabilities and additional features.

3. Maintenance: As a high-performance carburetor, the Holley 850 Double Pumper requires more frequent maintenance than a standard carburetor. This includes regular jetting and needle adjustments.

The Holley 4781 Holley 850 Double Pumper is a high-performance carburetor that offers increased flow rate, improved fuel efficiency, adjustability, durability, and versatility. However, it comes with a higher cost, complexity, and increased maintenance requirements. Ultimately, this carburetor is ideal for those seeking maximum horsepower and torque from their muscle car or hot rod, and who are willing to invest in the additional complexity and maintenance.

If you're looking for a high-performance carburetor for your muscle car or hot rod, and you're willing to invest in the additional complexity and maintenance requirements, the Holley 4781 Holley 850 Double Pumper is an excellent choice. It offers the flow rate, fuel efficiency, adjustability, durability, and versatility necessary for high-performance applications. However, if you're on a budget or prefer a simpler carburetor, there may be other options that better suit your needs.

Details:

Holly 850 carburetor.

part #: list4781 prices

• $189.50-$650.00

specifications carbcoon:

• for models: 850
• brand: Holley
• mpn: List4781
• choke type: Mechanical
• type: Carburetor
• mounting flange type: Square Bore
• oe/oem part number: Chevelle Mustang Gto Gran Sport
• material: Alloy
• country/region of manufacture: United States
• vintage part: Yes

payments carbcoon:

• credit card: Visa
• wallet: Paypal
• other

offer carbcoon:

• started: May 28, 2025
• sold: 0
• options: Ship-to-home
• quantity: 1
• availability: In Stock
• best offers: True

returns carbcoon:

• policy: No Returns

seller carbcoon:

• rating: 100.0%
• city: Holland, Michigan
• # reviews: 69

general carbcoon:

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

shipping carbcoon:

• service: USPS Priority Mail
• carrier: USPS
• transit: 3-9 Days
• class: Expedited
• cost: $21.84
• type: Calculated

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