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  3. HOLLEY 12R-5421B

HOLLEY 12R-5421B Barrel Carb

fits model: 12r, 400. make: Mopar. year: 1974.

12r-5421b Holley 12r 5421b 2 Barrel Carb 1974 Mopar 400

( Brand: Holley ), ( Manufacturer Part Number: 12R-5421B ), ( Type: Carburetor ), ( Choke Type: Mechanical ), ( Vintage Part: Yes ), ( Performance Part: No )

Review HOLLEY 5421b Barrel Carb Mopar fits 12R 400 1974

Introducing the Holley 12r-5421B 1974 Mopar 400 Barrel Carburetor, a high-performance replacement for your classic Mopar muscle car. This carburetor is a direct fit for 1974 Mopar 400 engines, offering superior fuel delivery and easy tunability for enhanced power and drivability.

The Holley 12r-5421B is a 4-barrel carburetor, featuring four 1.60-inch throttle bore barrels. Each barrel is equipped with a Holley's advanced bowl design, which ensures efficient fuel atomization and even fuel distribution for optimal combustion. The carburetor also comes with a 600 CFM venturi, making it suitable for both street and strip applications.

The carburetor's fuel bowl is made from high-strength aluminum, providing durability and resistance to corrosion. The bowl also includes a sight plug for easy fuel level checking, ensuring that you always have an accurate fuel level reading.

The Holley 12r-5421B also features a mechanical secondaries system, which provides a smooth power band and improved throttle response. This system uses a centrifugal secondary diaphragm and a high-performance accelerator pump to deliver fuel to the secondary throttle bodies during wide-open throttle conditions.

The carburetor's primary jets and needle are adjustable, allowing for easy tuning to your engine's specific requirements. The primary jets are available in sizes ranging from 0.028 to 0.098 inches, while the needle can be adjusted in 0.002-inch increments.

Additionally, the Holley 12r-5421B comes with a 6-ply BND gasket set, ensuring a proper seal between the carburetor and the intake manifold. The gasket set includes a manifold gasket, a carburetor gasket, and four throttle body gaskets.

The carburetor's floats are made from Holley's unique floater technology, which provides a consistent fuel level and eliminates the need for float level adjustments. The floats are also vented, which helps prevent fuel from sloshing during hard acceleration.

The Holley 12r-5421B 1974 Mopar 400 Barrel Carburetor is a high-quality, performance-oriented replacement for your classic muscle car. Its advanced design, tunability, and durability make it an excellent choice for both street and strip applications. So, upgrade your Mopar engine with this Holley carburetor and experience improved power, torque, and drivability.

The Holley 12r-5421B is a 12-branch, 500 CFM carburetor designed specifically for 1974 Mopar 400 engines. This carburetor is known for its reliability, ease of tuning, and high-performance capabilities. Here are some pros and cons of buying this carburetor for your Mopar 400:

Pros:

1. High-Performance: The Holley 12r-5421B offers excellent air/fuel mixture delivery, which results in increased horsepower and torque. It is ideal for performance-oriented applications.

2. Easily Tunable: Holley carburetors are widely known for their ease of tuning. The 12r-5421B is no exception, making it a popular choice among car enthusiasts.

3. Reliable: Holley carburetors have a reputation for durability and reliability. The 12r-5421B is designed to withstand the rigors of high-performance driving.

4. Wide Range of Applications: The 12r-5421B can be used on various Mopar engines, not just the 400. This versatility makes it a practical investment for those looking to work on multiple projects.

5. High-Quality Construction: The Holley 12r-5421B is made from high-quality materials, ensuring long-lasting performance.

Cons:

1. Complex Installation: Installing a Holley carburetor can be a complex process, especially for those without prior experience. It may require the assistance of a professional mechanic.

2. Cost: Compared to other carburetor options, the Holley 12r-5421B is more expensive. However, its performance benefits may justify the investment for some.

3. Potential Fuel Economy Issues: The Holley 12r-5421B is optimized for high-performance applications, which may result in decreased fuel economy.

Ending Conclusion:

The Holley 12r-5421B offers excellent high-performance capabilities and ease of tuning, making it a popular choice among Mopar enthusiasts. While it may have a complex installation process and a higher cost compared to other options, its durability, reliability, and wide range of applications make it a worthwhile investment for those seeking to enhance their Mopar engine's performance.

Recommendation:

If you are looking to enhance the performance of your Mopar 400 engine and are willing to invest in a high-quality, reliable carburetor, the Holley 12r-5421B is an excellent choice. However, it is recommended to consult a professional mechanic for installation to ensure proper setup and tuning.

Details:

No visible damage. Linkage works. Let me know what applications this belongs. Count on rebuilding it.

part #: 12r5421b prices

  • $130.00-$275.00

specifications carbcoon:

  • for models: 12r, 400
  • for makes: Mopar
  • for years: 1974
  • brand: Holley
  • mpn: 12r-5421b
  • type: Carburetor
  • choke type: Mechanical
  • vintage part: Yes
  • performance part: No

returns carbcoon:

  • time: 14 Days
  • paid by: Buyer
  • policy: Returns Accepted

offer carbcoon:

  • quantity: 1
  • availability: In Stock
  • options: Ship-to-home
  • started: July 6, 2025
  • sold: 0

shipping carbcoon:

  • carrier: USPS
  • type: Fixed
  • service: USPS Priority Mail
  • cost: $20.00
  • class: Expedited
  • transit: 4-9 Days

general carbcoon:

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

seller carbcoon:

  • rating: 99.6%
  • # reviews: 967
  • city: Derby, Kansas

payments carbcoon:

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for models: 12r, 400, for makes: mopar, for years: 1974, type: carburetor, choke type: mechanical, vintage part: yes, performance part: no,
category: auto parts > car truck parts accessories > air fuel delivery > carburetors, sku: 7049774419513762,

Holley 12R-5421B Is Similar To:

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2 offers $130.00–$275.00 USD
  • Offer #1: $130.00 price + $20.00 shipping estimate = $150.00* total. Let me know what applications this belongs to. No visible damage.+$20.00 shipping
  • Offer #2: $275.00 price + $19.45 shipping estimate = $294.45* total. Please see the photographs to make sure this item is what you want. This is a completely remanufactured Holly two barrel carburetor with casting numbers 12 R 5421B/R6575 one a/37693600953/6R4150B.+$19.45 shipping

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