1. USED Car/Truck Carburetors Items
  2. sku: 9273294702715632
  3. HOLLEY R-789A

HOLLEY R-789A Carburetor Reo 1789-H2

fits model: F22r, F22s, F226, F226m, F22, F122, Diamond, 6x6.

1789-h2 Holley R-789a R-789 Carburetor Diamond Reo F22r F22s F226 F226m F22 F122 6x6

( Brand: Holley ), ( Manufacturer Part Number: R-789A ), ( Country Of Origin: United States ), ( Choke Type: Carburetor ), ( Oe/oem Part Number: R789a, 1789-h2 ), ( Universal Fitment: No ), ( Vintage Part: Yes )

Review HOLLEY R-789 Carburetor Reo fits F22R F22S F226 F226M F22 F122 DIAMOND 6X6

Introducing the Holley R-789A/R-789 Carburetor, a high-performance fuel delivery solution specifically designed for various Diamond REO models including 1789-H2, F22R, F22S, F226, F226M, F22, and F122 6x6 trucks. This carburetor is engineered to deliver exceptional power, efficiency, and reliability for heavy-duty applications.

The R-789A/R-789 Carburetor boasts a unique design that offers superior fuel atomization and air/fuel mixture control. The unit features a 4-barrel configuration, each barrel equipped with a 1-1/16-inch venturi, resulting in increased air flow and improved throttle response. The carburetor also comes with a 350cfm air pump, capable of providing ample airflow for larger engines and demanding applications.

One of the standout features of this carburetor is its adjustability. The R-789A/R-789 comes with an array of adjustment options, including the primary and secondary metering rods, power valves, and idle mixture screws. These adjustments enable users to fine-tune the carburetor for optimal engine performance under various conditions, ensuring a smooth and responsive driving experience.

Another notable aspect of the R-789A/R-789 Carburetor is its construction. The unit is built with high-quality materials and precision manufacturing techniques, ensuring long-lasting durability and resistance to the harsh conditions commonly encountered in heavy-duty applications. The carburetor's base is made from cast aluminum, and the fuel bowls are constructed from billet aluminum, providing both strength and lightweight design.

In addition, the R-789A/R-789 Carburetor is compatible with various fuel systems, including both gasoline and diesel applications. It also includes a built-in electric choke, allowing for easy starting in cold weather conditions. The unit is designed to meet SFI 21 specifications, ensuring the highest level of safety and performance.

In summary, the Holley R-789A/R-789 Carburetor is an excellent choice for those seeking a high-performance, reliable, and versatile fuel delivery solution for their Diamond REO 1789-H2, F22R, F22S, F226, F226M, F22, and F122 6x6 trucks. With its adjustability, durability, compatibility with various fuel systems, and built-in electric choke, this carburetor is a must-have for heavy-duty applications where power, efficiency, and dependability are crucial.

The Holley R-789A carburetor is a popular choice for diesel engines in 6x6 vehicles such as Diamond REO models with engine types 1789-H2, F22R, F22S, F226, F226M, F22, and F122. This carburetor offers several advantages and disadvantages.

Advantages:

1. High-performance: Holley Carburetors are known for their high-performance capabilities, making them a popular choice for diesel engine enthusiasts. The R-789A model is no exception, delivering excellent fuel flow and air-fuel ratio for optimal engine performance.

2. Customizability: Holley Carburetors offer a high degree of customizability, allowing users to fine-tune the fuel mixture for their specific engine and driving conditions. This can help improve fuel efficiency, power output, and overall engine response.

3. Durability: Holley Carburetors are built to last, with high-quality materials and robust construction. This makes them ideal for the demands of off-road and heavy-duty applications.

4. Wide application range: The R-789A carburetor is compatible with a wide range of engine types and applications, making it a versatile choice for diesel enthusiasts.

Disadvantages:

1. Complexity: Holley Carburetors can be complex to install and tune, requiring a certain level of expertise and knowledge. This can be a barrier for some users, particularly those who are new to carbureted diesel engines.

2. Cost: Holley Carburetors are generally more expensive than other types of carburetors or fuel systems, such as electronic fuel injection. This can be a significant investment for some users.

3. Maintenance: Carburetors require regular maintenance to ensure optimal performance, including cleaning, adjusting, and replacing worn parts. This can be time-consuming and add to the overall cost of ownership.

Conclusion:

The Holley R-789A carburetor offers several advantages for diesel engine enthusiasts, including high performance, customizability, durability, and wide application range. However, it also comes with some disadvantages, such as complexity, cost, and maintenance requirements. If you are comfortable with the complexity and willing to invest the time and resources into tuning and maintaining the carburetor, it can be a rewarding choice for your Diamond REO 6x6. If you prefer a simpler, more cost-effective solution, you may want to consider other options, such as electronic fuel injection. Ultimately, the decision depends on your individual needs, preferences, and expertise.

Details:

We combine shipping. Buyer pays return shipping. Like what you see. All of the moving parts move properly.

Please look closely at the pictures for condition before buying. Any questions. What you see is what get. This means there could be some discoloration, markings, scratches, or other defect.

part #: r789a price

  • $124.99

specifications carbcoon:

  • for models: F22r, F22s, F226, F226m, F22, F122, Diamond, 6x6
  • brand: Holley
  • mpn: R-789a
  • country of origin: United States
  • choke type: Carburetor
  • oe/oem part number: R789a, 1789-h2
  • universal fitment: No
  • vintage part: Yes

offer carbcoon:

  • availability: In Stock
  • best offers: True
  • started: December 9, 2025
  • sold: 0
  • options: Ship-to-home
  • quantity: 1

seller carbcoon:

  • city: Andover, Minnesota
  • # reviews: 4710
  • rating: 99.7%

returns carbcoon:

  • paid by: Buyer
  • policy: Returns Accepted
  • time: 30 Days

shipping carbcoon:

  • service: USPS Ground Advantage
  • class: Standard
  • transit: 3-8 Days
  • carrier: USPS
  • cost: $26.72
  • type: Fixed

general carbcoon:

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

payments carbcoon:

  • wallet: Google-pay
  • other
  • credit card: Diners-club
for models: f22r, f22s, f226, f226m, f22, f122, diamond, 6x6, country of origin: united states, choke type: carburetor, oe/oem part number: r789a, 1789-h2, universal fitment: no, vintage part: yes,
category: auto parts > car truck parts accessories > air fuel delivery > carburetors, sku: 9273294702715632,

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1 offer $124.99 USD
  • Offer #1: $124.99 price + $26.72 shipping estimate = $151.71* total. All of the moving parts move properly.+$26.72 shipping

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