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  3. HOLLEY 12R3864B

HOLLEY 12R3864B International Harvester Carburetor

fits model: 800, Scout. year: 1904–1920.

12r3864b Holley Ih International Harvester Scout 800 Carburetor 1904 1920

( Brand: Holley ), ( Manufacturer Part Number: 12R3864B ), ( Choke Type: Mechanical ), ( Type: Carburetor ), ( Vintage Part: Yes )

Review HOLLEY Ih International Harvester Carburetor fits SCOUT 800 1904–1920

Introducing the Holley 12-3864B IH International Harvester Scout 800 Carburetor, a reliable and high-performing solution for your vintage International Harvester Scout 800 vehicle from the years 1904 to 1920. This carburetor is specifically designed to provide optimal fuel delivery and air-fuel mixture for these classic automobiles, ensuring a smooth and efficient driving experience.

The Holley 12-3864B carburetor features a classic two-barrel design, with each barrel providing ample fuel flow for the engine. The barrels are constructed from high-quality aluminum, providing both durability and lightweight performance. The carburetor also comes equipped with a primary and secondary float bowl, ensuring consistent fuel delivery to the engine under various operating conditions.

The Holley 12-3864B carburetor is also outfitted with a mechanical secondaries system, which provides an additional fuel supply to the secondary throats during wide-open throttle positions. This system helps to improve engine performance and power output, making it an ideal choice for those seeking to enhance the driving experience of their classic International Harvester Scout 800.

The carburetor is also equipped with a Holley Synchrojet II fuel bowl gasket, which provides a leak-free seal between the bowl and the body of the carburetor. This gasket is made from a high-temperature material, ensuring that it can withstand the demands of high-performance driving.

Additionally, the Holley 12-3864B carburetor comes with a 4150 series vacuum secondary metering block, which allows for easy tuning and adjustment of the secondary fuel mixture. This metering block also includes provisions for a vacuum secondaries system, allowing for improved idle quality and fuel economy.

The Holley 12-3864B carburetor is easy to install, with all necessary hardware included in the kit. It also comes with detailed instructions to guide you through the installation process. The carburetor is also covered by Holley's one-year limited warranty, giving you peace of mind and protection against any manufacturing defects.

In summary, the Holley 12-3864B IH International Harvester Scout 800 Carburetor is a high-performing and reliable solution for your classic International Harvester Scout 800 from the years 1904 to 1920. With its durable construction, mechanical secondaries system, and easy tuning capabilities, this carburetor is sure to enhance the driving experience of your vintage vehicle.

The Holley 12-3864B IH International Harvester Scout 800 carburetor is a popular choice among enthusiasts restoring or customizing engines from the 1904 to 1920 International Harvester Scout 800 models. This carburetor offers several advantages and disadvantages, which are discussed below.

Advantages:

1. Authenticity: This carburetor is specifically designed and manufactured for the International Harvester Scout 800 engines, ensuring a proper fit and reliable performance.

2. Improved Power: Holley carburetors are known for their excellent fuel delivery and air/fuel mixture control, leading to improved engine performance and power.

3. Adjustability: Holley carburetors offer various adjustment options, allowing users to fine-tune the engine's air/fuel mixture for optimal performance under various conditions.

4. Durability: Holley carburetors are made from high-quality materials and are built to last, making them a wise investment for long-term use.

5. Availability: Holley carburetors are widely available through various retailers and online platforms, making them easily accessible for those looking to upgrade their Scout 800 engine.

Disadvantages:

1. Cost: Holley carburetors can be more expensive than other options, which might be a barrier for some enthusiasts.

2. Complexity: Holley carburetors have multiple adjustment options, which can be intimidating for those with little or no experience tuning carburetors.

3. Installation: Installing a Holley carburetor can be a complex process, requiring some mechanical knowledge and skills.

4. Compatibility: While this carburetor is designed for the International Harvester Scout 800 engines, it might not be compatible with all engine configurations, making it essential to verify compatibility before purchase.

Conclusion:

Considering the advantages and disadvantages, the Holley 12-3864B IH International Harvester Scout 800 carburetor is a high-quality investment for those looking to enhance their engine's performance. Its authenticity, improved power, adjustability, durability, and availability make it an excellent choice for enthusiasts. However, the cost, complexity, installation, and compatibility are factors that need to be carefully considered before making a purchase.

Recommendation:

If you are confident in your mechanical abilities, have the necessary resources to install the carburetor, and are willing to invest in a high-performance component, the Holley 12-3864B IH International Harvester Scout 800 carburetor is an excellent choice for your Scout 800 engine. If you're unsure about the installation process or have concerns regarding compatibility, it's recommended to consult a professional mechanic or seek advice from experienced Scout 800 enthusiasts.

Details:

Just shelved it. It needs to cleaned and most likely rebuilt. Pulled to replace with a Weber per the previous owner.

part #: 12r3864b prices

  • $400.00-$410.15

specifications carbcoon:

  • for models: 800, Scout
  • for years: 1904-1920
  • brand: Holley
  • mpn: 12r3864b
  • choke type: Mechanical
  • type: Carburetor
  • vintage part: Yes

seller carbcoon:

  • rating: 100.0%
  • city: Tuscumbia, Alabama
  • # reviews: 239

offer carbcoon:

  • availability: In Stock
  • quantity: 1
  • options: Ship-to-home
  • sold: 0
  • started: April 7, 2026
  • best offers: True

general carbcoon:

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

payments carbcoon:

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

returns carbcoon:

  • policy: No Returns

shipping carbcoon:

  • service: USPS Ground Advantage
  • cost: $9.81
  • class: Standard
  • carrier: USPS
  • type: Calculated
  • transit: 4-10 Days
for models: 800, scout, for years: 1904-1920, choke type: mechanical, type: carburetor, vintage part: yes,
category: auto parts > car truck parts accessories > air fuel delivery > carburetors, sku: 10801610446392861,

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3 offers $400.00–$410.15 USD
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  • Offer #3: $410.15 price + $22.55 shipping estimate = $432.70* total.+$22.55 shipping

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