HOLLEY 20-221BK Mount Gm 090127056516

( Brand: Holley ), ( Manufacturer Part Number: 20-221BK ), ( Part Type: Mount ), ( UPC: 090127056516 )

Review HOLLEY Premium Mid mount Complete Accessory System gm Gen Dry fits LT4

The Holley 20-221BK Mid-Mount EFI System is a high-performance fuel injection solution designed specifically for General Motors LS9 and LSA engines found in the 2009-2013 Chevrolet Corvette ZR1 and Cadillac CTS-V. This mid-mount system is an excellent upgrade for enthusiasts seeking improved throttle response, increased power, and better fuel efficiency.

The heart of this system is Holley's EFI Brain, a state-of-the-art 10-mode engine management computer. It offers advanced features like knock control, traction control, adjustable rev limit, and multiple fuel and ignition maps. The EFI Brain is also capable of supporting various drive-by-wire applications, making it a versatile choice for a wide range of performance applications.

The Holley 20-221BK Mid-Mount EFI System includes a high-flow, 650cfm Holley SysteMax EFI intake manifold, which is designed to provide excellent airflow and even fuel distribution to the engine. It also features a built-in throttle body, eliminating the need for additional components.

The system comes with an integrated fuel system, featuring a high-pressure fuel pump, a 10-micron fuel filter, and a pair of 105-lb/hr Holley Sniper EFI fuel pumps. These pumps are capable of delivering ample fuel to support high horsepower applications. Additionally, the system includes a fuel pressure regulator, fuel pressure sensor, and a set of wiring harnesses to simplify the installation process.

The Holley 20-221BK Mid-Mount EFI System is designed to be a direct replacement for the OEM throttle body and intake manifold setup. It is compatible with factory engine wiring harnesses and can be easily integrated with the factory engine harness using the provided connectors.

This EFI system offers several advantages over the factory setup, including improved throttle response, increased power output, and the ability to adjust various parameters to optimize performance for different driving conditions. Additionally, it offers better fuel efficiency, which can lead to cost savings in the long run.

In summary, the Holley 20-221BK Mid-Mount EFI System is a high-performance fuel injection solution for General Motors LS9 and LSA engines. It offers improved throttle response, increased power, better fuel efficiency, and advanced features like knock control and traction control. With a direct replacement intake manifold and integrated fuel system, installation is simplified, making it an excellent choice for enthusiasts looking to take their LS9 or LSA powered vehicles to the next level.

The Holley 20-221BK Mid-Mount EFI System is a popular choice for GM LT4 engines. This EFI (Electronic Fuel Injection) system offers several advantages and disadvantages that potential buyers should consider before making a purchase.

1. Improved Fuel Efficiency: EFI systems, like the Holley 20-221BK, deliver fuel more precisely than carburetors. This results in improved fuel efficiency as the engine only receives the exact amount of fuel it needs, reducing fuel waste.

2. Consistent Performance: EFI systems deliver a consistent fuel mixture throughout the engine's RPM range. This ensures that the engine runs smoothly and efficiently at all times, leading to better overall performance.

3. Easy-to-Use: The Holley 221BK Mid-Mount system is relatively easy to install and use. It comes with a wiring harness and all necessary components, making the installation process less time-consuming and complex.

4. Adjustable Fuel Mapping: The system offers adjustable fuel mapping, allowing users to fine-tune the fuel mixture to their specific engine and driving conditions. This results in optimal engine performance.

1. Higher Cost: An EFI system like the Holley 20-221BK is more expensive than a carburetor. The cost includes the system itself, as well as any additional components or modifications required for installation.

2. Complexity: While the installation process is relatively easy, the Holley 20-221BK Mid-Mount EFI System is more complex than a carburetor. Users may need to invest time in learning how to use and maintain the system to ensure optimal performance.

3. Potential for Complications: EFI systems can be sensitive to various factors, such as temperature and humidity. These factors can affect the system's performance and may require additional maintenance or adjustments to ensure proper operation.

The Holley 20-221BK Mid-Mount EFI System offers several advantages, including improved fuel efficiency, consistent performance, ease-of-use, and adjustable fuel mapping. However, it also comes with some disadvantages, such as higher cost, complexity, and potential complications.

If you are looking for improved engine performance, better fuel efficiency, and the ability to fine-tune your engine's fuel mixture, the Holley 20-221BK Mid-Mount EFI System is an excellent choice. However, it is essential to consider the system's higher cost, complexity, and potential complications before making a purchase. Prospective buyers should be prepared to invest time and resources in learning how to use and maintain the system to ensure optimal performance.

Details:

Holley incorporates a splinted dual bearing system that eliminates all belt stresses on the P/S pumps internal bearings, assuring long life. The supercharger drive maintains the original and optimized belt path pensioner. 20-221BK Holley Premium Mid-Mount Complete Accessory System-GM Gen V LT4 Dry Sump Engines: GM Drive System w/ Alt, P/S, A/C, Water Pump, Belts, and hardware. A signature is required on all UPS orders over $750.

Plus, they add the much needed hydraulic power steering solution. The accessory layout is as if the original manufacturer had designed it for your swap application. Holley's complete accessory systems for LT4 and LT5 applications have all accessories pulled up in tight. Black finish.

Buyer pays return shipping. There are no shortcuts here.

part #: 20221bk prices

• $3799.95-$4011.32

specifications bepubrac:

• for models: Lt4
• brand: Holley
• mpn: 20-221bk
• part type: Mount
• upc: 090127056516

returns bepubrac:

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

offer bepubrac:

• started: July 24, 2025
• options: Ship-to-home
• quantity: 8
• sold: 0
• availability: In Stock

payments bepubrac:

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

general bepubrac:

• condition: New
• Car Truck Parts Accessories > Accessory Belts > Belts

seller bepubrac:

• rating: 98.9%
• # reviews: 15281
• city: Bowling Green, Kentucky

shipping bepubrac:

• class: Standard
• service: UPS Ground
• cost: $0.00
• type: Fixed
• transit: 4-8 Days
• carrier: UPS

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