HOLLEY 20-221 Mount Gm 090127056509

( Brand: Holley ), ( Manufacturer Part Number: 20-221 ), ( Part Type: Mount ), ( UPC: 090127056509 )

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

The Holley 20-221 Mid-Mount EFI System is a high-performance fuel injection solution designed specifically for GM Gen LT4 engines. This mid-mount system is a complete, plug-and-play EFI kit that includes all the necessary components for a seamless installation.

The heart of this system is the Holley Sniper EFI fuel injection system, which utilizes a 650 CFM Holley Sniper EFI single-plane throttle body. The throttle body features a fully machined billet aluminum design, with a unique vacuum secondary idle circuit that provides excellent idle quality and stability. The fuel injectors are capable of delivering precise fuel dosing through Holley's proven high-impedance design, ensuring optimal engine performance and efficiency.

The mid-mount design of this system allows for a more compact installation, as it mounts the fuel pump, fuel filter, and fuel pressure regulator in a central location. The system comes with a Holley 231 fuel pump, which is capable of delivering up to 350 LPH of fuel flow at 32psi. The pump is designed for longevity and reliability, with a double-sealed shaft and a billet aluminum housing.

The Holley 20-221 Mid-Mount EFI System also includes a wiring harness, fuel lines, and all necessary hardware for a complete installation. The wiring harness is fully labeled and color-coded for ease of installation, and includes a wide range of sensors to monitor critical engine functions. The fuel lines are made of high-quality, reinforced PTFE material, ensuring that they can withstand the rigors of high-performance applications.

This EFI system is also compatible with a wide range of fuel sources, including gas, E85, and methanol. It also includes Holley's exclusive HP EFI calibration software, which allows for easy tuning and calibration of the system. The software also includes a wide range of pre-loaded calibrations for common applications, making it an excellent choice for both street and racing applications.

In summary, the Holley 20-221 Mid-Mount EFI System is a high-performance, plug-and-play fuel injection solution for GM Gen LT4 engines. It features a compact mid-mount design, a high-flow fuel pump, a high-impedance fuel injection system, and a wide range of sensors and calibration options. With its ease of installation, reliability, and versatility, this system is an excellent choice for anyone looking to upgrade their GM Gen LT4 engine with a high-performance EFI system.

The Holley 20-221 Mid-Mount EFI System for GM Gen LT4 engines is a popular choice among performance enthusiasts seeking to upgrade their fuel delivery system. This system offers several advantages and disadvantages, which are discussed below:

1. Improved Fuel Delivery: The Holley Mid-Mount EFI System offers precise fuel delivery, which is essential for optimal engine performance. This system's fuel injection technology ensures consistent fuel pressure and delivery, resulting in improved throttle response and better fuel economy.

2. Easy Installation: The mid-mount design of this Holley system allows for easier installation compared to other EFI systems. It can be mounted directly to the intake manifold, requiring fewer modifications to the engine bay. Additionally, it includes a wiring harness for simple connection to the engine's electrical system.

3. Customizable: The Holley EFI system offers various tuning options, allowing users to customize the fuel delivery settings to their specific engine and driving preferences. This fine-tuning can lead to improved power output and fuel efficiency.

1. Cost: The Holley Mid-Mount EFI System can be more expensive than other fuel injection systems, making it a significant investment for some enthusiasts.

2. Complexity: While the installation process may be easier compared to other EFI systems, the Holley system still requires a certain level of expertise and knowledge to properly set up and tune. This complexity may deter some users who prefer a simpler solution.

In conclusion, the Holley 20-221 Mid-Mount EFI System offers several advantages, including improved fuel delivery, easy installation, and customizability. However, it also comes with some disadvantages, such as cost and complexity. Ultimately, the decision to purchase this system depends on an individual's budget, technical expertise, and performance goals.

If you are confident in your ability to install and tune the system, have the necessary budget, and desire improved engine performance, then the Holley Mid-Mount EFI System is a worthwhile investment. However, if you are on a tight budget or prefer a simpler solution, other options may be more suitable for your needs.

Details:

There are no shortcuts here. Buyer pays return shipping. Holley's complete accessory systems for LT4 and LT5 applications have all accessories pulled up in tight. 20-221 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.

The supercharger drive maintains the original and optimized belt path pensioner. A signature is required on all UPS orders over $750. The accessory layout is as if the original manufacturer had designed it for your swap application. Holley incorporates a splinted dual bearing system that eliminates all belt stresses on the P/S pumps internal bearings, assuring long life.

Plus, they add the much needed hydraulic power steering solution.

part #: 20221 prices

• $3549.95-$3769.65

specifications bepubrac:

• for models: Lt4
• brand: Holley
• mpn: 20-221
• part type: Mount
• upc: 090127056509

returns bepubrac:

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

general bepubrac:

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

seller bepubrac:

• rating: 99.0%
• # reviews: 15235
• city: Bowling Green, Kentucky

payments bepubrac:

• wallet: Apple-pay
• other
• credit card: Diners-club

offer bepubrac:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: July 12, 2025
• quantity: 2

shipping bepubrac:

• cost: $0.00
• type: Fixed
• carrier: UPS
• transit: 4-10 Days
• class: Standard
• service: UPS Ground

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