HOLLEY 4545-S Cfm Carburetor 0957

( Brand: Holley ), ( Manufacturer Part Number: 4545-S ), ( Type: Carburetor ), ( Vintage Part: Yes ), ( Country/region Of Manufacture: United States )

Review HOLLEY Cfm Carburetor List 4548s Date Refurbished fits 450

The Holley 4545-S 450 CFM Carburetor, model number 4548S-0957-4548, is a high-performance, fuel-injected carburetor designed for serious enthusiasts seeking optimal engine performance. This carburetor is part of Holley's Serpentity Series, which combines the advantages of a traditional carburetor with the benefits of electronic fuel injection.

The 450 CFM net flow rate makes this carburetor suitable for larger engines, such as big-block Chevy, Ford, or Chrysler applications. The carburetor features a unique design, with a serpentine-style base plate that allows for easy installation and superior vacuum operation. The base plate also includes provisions for electric choke and accessory drives.

The 4548S-0957-4548 carburetor comes equipped with Holley's Electronic Fuel Injection system, which utilizes a 75-pound-per-hour fuel pump and an integrated fuel pressure regulator. This system provides precise fuel delivery and allows for easy tuning through Holley's EFI management software.

The carburetor body is made of high-quality aluminum and features a polished finish, giving it an attractive appearance. The bowl and float are made of glass-filled nylon, ensuring durability and resistance to fuel and temperature extremes. The float levels are adjustable, allowing for fine-tuning of the carburetor's performance.

The 4545-S carburetor includes Holley's HP series throttle bodies, which are known for their smooth operation and quick response. The throttle bodies are also designed to accommodate various intake manifold configurations, making this carburetor a versatile option for a wide range of applications.

Additionally, the carburetor comes with Holley's proven vacuum secondary system, which provides excellent idle quality and smooth power delivery throughout the RPM range. The secondary system includes a 5-position vacuum secondary plate, allowing for easy tuning of the carburetor's performance under various engine conditions.

In summary, the Holley 4545-S 450 CFM Carburetor, model number 4548S-0957-4548, is a high-performance, fuel-injected carburetor designed for serious enthusiasts seeking optimal engine performance. Its unique design, precise fuel delivery, and adjustable features make it a versatile option for a wide range of applications, while its attractive finish adds a touch of style to any engine bay.

Holley 4545-S 450 CFM Carburetor: A Detailed Analysis

The Holley 4545-S 450 CFM Carburetor, with part numbers 4548S-0957 and 4548, is a popular choice among automotive enthusiasts for its high performance and versatility. In this analysis, we will discuss its key features, advantages, and disadvantages to help you make an informed decision about purchasing this carburetor.

1. Four-barrel design for enhanced air and fuel delivery.

2. Adjustable primary and secondary jet circles for fine-tuning.

3. Accu-Matic fuel pressure regulator for consistent fuel delivery.

4. Holley's HP series internals for increased durability.

5. Mounting bosses for easy installation.

1. High air flow rate for increased horsepower and torque.

2. Adjustability for fine-tuning the fuel mixture for various driving conditions.

3. Durable design for long-lasting performance.

4. Wide compatibility with various engines and applications.

1. Relatively complex installation process compared to single-barrel carburetors.

2. Requires more maintenance, including frequent jetting adjustments.

3. May require additional accessories, such as a fuel pressure regulator or electric choke, depending on the application.

The Holley 4545-S 450 CFM Carburetor is an excellent choice for automotive enthusiasts seeking high performance and versatility. Its high air flow rate, adjustability, and durability make it a popular option for both street and racing applications. However, its complex installation process, increased maintenance requirements, and potential need for additional accessories are important considerations.

If you are looking for a high-performance carburetor with the ability to fine-tune the fuel mixture for various driving conditions, the Holley 4545-S 450 CFM Carburetor is an excellent choice. However, be prepared for a more complex installation process and increased maintenance requirements. If you are new to carbureted engines or prefer a simpler setup, a single-barrel carburetor may be a better fit for your needs.

Details:

Secondary Metering Plate#30 63 jet equivalent. Primary jets #58. No Ford Down shift Linkage. Really nice 4548s carb Date 0957 450 cfm vacuum secondary.

Primary metering block6343 6104. Before Buying Check the pictures carefully for full compatibility your situation. No return on carburetors. Plain spring in vacuum secondary actuator.

Automatic choke. Dip Tank cleaned and assembled with a Holley non stick rebuild kit.

part #: 4545-s prices

• $149.99-$200.00

specifications carbcoon:

• for models: 450
• brand: Holley
• mpn: 4545-s
• type: Carburetor
• vintage part: Yes
• country/region of manufacture: United States

returns carbcoon:

• policy: No Returns

general carbcoon:

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

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shipping carbcoon:

• service: UPS Ground Saver
• cost: $17.54
• carrier: UPS
• type: Calculated
• class: Economy
• transit: 5-10 Days

offer carbcoon:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 1
• best offers: True
• started: July 12, 2025

seller carbcoon:

• city: Livonia, Michigan
• # reviews: 759
• rating: 100.0%

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