CARTER CARBBU50 Afb Carburetor 2507S 4BBL

( Brand: Carter ), ( Manufacturer Part Number: CARBBU50 ), ( Choke Type: Automatic ), ( Type: Carburetor ), ( Oe/oem Part Number: 2507s ), ( Manufacturer Warranty: 1 Year ), ( Items Included: Gasket ), ( Vintage Part: Yes ), ( Universal Fitment: No )

Review CARTER Used Afb Carburetor Buick Super fits CENTURY ROADMASTER 1957

The Carter AFB 4bbl carburetor, model number 2507S, is a legendary fuel delivery system that was originally designed for use in the 1957 Buick Century Roadmaster and other select Buick models of that era. This carburetor is a 4-barrel design, meaning it features four separate barrels, each with its own intake valve and choke port, which allows for a more efficient and powerful air-fuel mixture to be delivered to the engine.

Each barrel in this carburetor is equipped with a 500 CFM (cubic feet per minute) venturi, which is the area where the air and fuel are mixed prior to being delivered to the engine. The venturis are connected to a single throttle body, which is controlled by a quadrant-style accelerator pump. This design ensures smooth and responsive acceleration, particularly when the driver presses the gas pedal.

One of the standout features of the Carter AFB 2507S carburetor is its automatic choke system, which uses a vacuum-operated mechanism to enrich the fuel mixture during engine start-up. This feature helps ensure a consistent and strong idle once the engine is running, which is crucial for a smooth driving experience.

The base plate of the carburetor features a unique "AFB" (Automatic Flash Bulb) design, which utilizes a hot bulb to regulate the idle mixture. This design helps to maintain a consistent engine temperature and idle speed, even in varying driving conditions.

The Carter AFB 2507S carburetor is also notable for its durability and ease of maintenance. It features robust construction, with a cast-iron base and brass components that are resistant to wear and corrosion. Additionally, it includes easily accessible adjustment screws for fine-tuning the idle mixture and fuel delivery, making it a popular choice among enthusiasts and restorers.

In summary, the Carter AFB 4bbl carburetor, model number 2507S, is a high-performance, durable, and versatile fuel delivery system that was specifically designed for use in the 1957 Buick Century Roadmaster and other select Buick models. Its 4-barrel design, automatic choke system, and AFB idling system make it an excellent choice for those seeking optimal engine performance and a smooth driving experience.

The Carter AFB 4bbl carburetor, model number 2507S BU50, is a four-barrel carburetor that was originally designed for use in 1957 Buick Century and Roadmaster vehicles. Here are some potential pros and cons of buying this carburetor for restoration or performance upgrades on a Buick Century or Roadmaster:

1. Authenticity: This carburetor is an original equipment manufacturer (OEM) part, which means it was manufactured by the same company that originally supplied these carburetors to Buick for their cars. Using an OEM part can help maintain the authenticity and value of a classic Buick.

2. Availability: These carburetors are still readily available from various suppliers, including new old stock (NOS) and rebuilt options. This means that it should be relatively easy to find one that fits your needs.

3. Performance: Four-barrel carburetors generally provide better performance than single or dual-barrel carburetors, as they allow for more fuel and air mixture to be delivered to the engine. This can lead to increased horsepower and torque.

4. Adjustability: Four-barrel carburetors offer more adjustability than single or dual-barrel carburetors, allowing for fine-tuning of the fuel mixture and air/fuel ratio to optimize engine performance.

1. Complexity: Four-barrel carburetors are more complex than single or dual-barrel carburetors, which can make them more difficult to install, tune, and maintain. This can require more time, expertise, and resources.

2. Cost: Four-barrel carburetors generally cost more than single or dual-barrel carburetors due to their complexity and performance benefits. This can be a significant investment for some enthusiasts.

3. Compatibility: It is important to ensure that the specific model of Carter AFB 4bbl carburetor (2507S BU50) is compatible with the specific year and model of Buick Century or Roadmaster that you are working on. Failure to do so could result in poor performance or even damage to the engine.

The Carter AFB 4bbl carburetor (model number 2507S BU50) is an authentic, high-performance option for those restoring or upgrading a 1957 Buick Century or Roadmaster. While it offers numerous benefits, such as improved performance and adjustability, it also comes with some drawbacks, such as complexity and cost. Ultimately, the decision to purchase this carburetor will depend on the specific needs and resources of the enthusiast.

If you are serious about restoring or upgrading a 1957 Buick Century or Roadmaster and are looking for a high-performance carburetor, then the Carter AFB 4bbl carburetor (model number 2507S BU50) is definitely worth considering. However, before making a purchase, be sure to do your research and ensure that the specific model is compatible with your vehicle. Additionally, be prepared for the additional complexity and cost associated with a four-barrel carburetor.

Details:

Manufacturer: CARTER. Up for sale is a Carter AFB # 2507S. 1957 Buick series 50 Super, 60 Century, 70 Roadmaster - when equipped with Carter AFB 4BBL carburetor. Has been sitting inside for years, everything moves freely.

Use it as a core or to rebuild. Manufacturers #: 2507S.

part #: carbbu50 prices

• $57.71-$539.99

specifications carbcoon:

• for models: Century, Roadmaster
• for makes: Buick
• for years: 1957
• brand: Carter
• mpn: Carbbu50
• choke type: Automatic
• type: Carburetor
• oe/oem part number: 2507s
• manufacturer warranty: 1 Year
• items included: Gasket
• vintage part: Yes
• universal fitment: No

returns carbcoon:

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

offer carbcoon:

• availability: In Stock
• options: Ship-to-home
• best offers: True
• sold: 0
• started: May 2, 2026
• quantity: 1

payments carbcoon:

• other
• wallet: Apple-pay
• credit card: Mastercard

general carbcoon:

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

seller carbcoon:

• # reviews: 1622
• rating: 99.1%
• city: Novato, California

shipping carbcoon:

• carrier: USPS
• service: USPS Ground Advantage
• transit: 4-9 Days
• cost: $15.73
• class: Standard
• type: Calculated

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