HOLLEY 4781-9 Carburetor Cfm Double Pumper 0-4781SA

( Brand: Holley ), ( Manufacturer Part Number: 4781-9 ), ( Type: Carburetor ), ( Choke Type: Mechanical ), ( Mounting Flange Type: Square Bore ), ( Performance Part: Yes )

Review HOLLEY Carburetor Cfm Double Pumper Same Spec As 0-4781s fits 850

The Holley 4781-9 Carburetor is a high-performance double pumper unit with an impressive flow rate of 850 CFM, making it an excellent choice for large displacement engines. This carburetor is part of Holley's Serpantine Drive System (SDS) product line.

This 4-barrel carburetor features Holley's unique design, which includes a double pumper system. The dual pumps ensure consistent vacuum in the secondary circuit, delivering a more responsive throttle and improved fuel delivery under wide-open throttle conditions. It also allows for the use of larger jets and needle sizes, which is beneficial for high-horsepower applications.

The 0-4781SA and 0-4781S designations refer to the specific base castings that come with this carburetor. The 0-4781SA base casting includes a vacuum secondary, while the 0-4781S base casting features a mechanical secondary. Both options cater to different engine setups and driving preferences.

The Holley 4781-9 Carburetor is designed with a high-quality billet aluminum fuel bowl and base, which not only adds to its aesthetic appeal but also offers improved durability. The bowl has a generous 1.5-quart capacity, ensuring ample fuel supply for even the most demanding engines.

The carburetor's primary jets come in various sizes, with options ranging from 38 to 118 GPH. The secondary jets have sizes ranging from 12 to 110 GPH. The needle and jet kit (sold separately) offers fine-tuning capabilities for optimizing fuel delivery based on engine size, camshaft profile, and other factors.

The Holley 4781-9 Carburetor is a versatile and powerful option for enthusiasts seeking to enhance their engine's performance. Its unique double pumper design, combined with the availability of various base castings, makes it an adaptable solution for a wide range of applications. With its large CFM flow rate and high-quality components, this carburetor is sure to deliver exceptional power and responsiveness.

The Holley 4781-9 850 CFM Double Pumper carburetor (parts numbers 0-4781SA and 0-4781S) is a popular choice among hot rod and performance enthusiasts. This carburetor offers several advantages, but it also comes with some potential drawbacks. Let's explore the pros and cons of this Holley carburetor.

1. High CFM (Cubic Feet per Minute) rating: The 850 CFM rating makes this carburetor suitable for high-performance applications, providing ample fuel flow for large engines.

2. Double Pumper design: This design offers improved vacuum secondaries, providing better idle quality and increased power at higher RPMs.

3. Flexible tuning capabilities: Holley offers various tuneable parts for this carburetor, allowing users to fine-tune the idle, mixture, and other aspects for their specific engine setup.

4. Wide compatibility: The Holley 4781-9 can be used on various engine types, including small-block and big-block Chevy, Ford, and Chrysler applications.

5. Durable construction: Holley carburetors are known for their robust design and long-lasting components, making them a reliable choice for performance applications.

1. Complexity: Due to its high-performance features, the Holley 4781-9 can be more complex to install and tune compared to simpler single-barrel or two-barrel carburetors.

2. Cost: As a high-performance carburetor, the Holley 4781-9 comes with a higher price tag compared to more basic options.

3. Fuel economy: The high-performance nature of this carburetor may lead to reduced fuel economy, which could be a concern for some users.

4. Maintenance requirements: A high-performance carburetor like the Holley 4781-9 requires more frequent maintenance and adjustments to ensure optimal performance.

In conclusion, the Holley 4781-9 850 CFM Double Pumper carburetor offers significant advantages for high-performance applications, including improved power output, flexible tuning capabilities, and wide compatibility. However, its complexity, cost, potential impact on fuel economy, and increased maintenance requirements are important considerations.

If you're looking for a high-performance carburetor for your project and are willing to invest the time and resources into its installation, tuning, and maintenance, the Holley 4781-9 may be an excellent choice for you. However, if you prefer a simpler, more cost-effective solution with less maintenance requirements, you may want to consider other options. Ultimately, the decision depends on your specific application, budget, and personal preferences.

Details:

Please verify part numbers and compatibility before purchase. Holley 4781 9 850 cfm Double Pumper Mechanical Secondaries New Take Off. This is your opportunity to get the same OEM spec carburetor at a better price. Brand new, never fueled or mounted on a running engine.

Current 4781S/0 4781C equivalents sell new for $799 $899. Secondaries: Mechanical. Removed from a new Blueprint engine and never run. Fuel Inlet's: Dual feed.

Brand new, never used Holley 4781 9 carburetor. This model is an earlier production version of Holley part numbers 4781SA discontinued and 4781S current. Ships via USPS Priority Mail. Please review all photos carefully for exact condition before purchasing.

Direct replacement in any application calling for those model's. Brand: Holley. Applications: Universal performance small/big block Chevy, Ford, Mopar, street/strip builds. Item Details.

All share the same specifications and performance. Choke: Manual. Compatibility Note. Removed from a new crate engine for aftermarket tuning preference.

part #: 47819 prices

• $322.18-$599.99

specifications carbcoon:

• for models: 850
• brand: Holley
• mpn: 4781-9
• type: Carburetor
• choke type: Mechanical
• mounting flange type: Square Bore
• performance part: Yes

payments carbcoon:

• other
• credit card: Diners-club
• wallet: Google-pay

returns carbcoon:

• policy: No Returns

offer carbcoon:

• started: August 4, 2025
• sold: 0
• best offers: True
• availability: In Stock
• options: Ship-to-home
• quantity: 1

shipping carbcoon:

• service: USPS Priority Mail
• type: Calculated
• class: Expedited
• transit: 3-9 Days
• cost: $33.00
• carrier: USPS

general carbcoon:

• condition: New other see details
• Car Truck Parts Accessories > Air Fuel Delivery > Carburetors

seller carbcoon:

• # reviews: 5
• rating: 100.0%
• city: Dunnellon, Florida

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