HOLLEY EFI 558-502 Gm Ls Harness Kit 090127721339 58X

( Brand: Holley Efi ), ( Part Type: Harness ), ( UPC: 090127721339 ), ( Manufacturer Part Number: 558-502 )

Review HOLLEY EFI Gm Ls 58x Harness Kit

The Holley EFI 558-502 harness kit is a high-performance solution designed specifically for GM LS engines, particularly those producing up to 58x horsepower. This harness kit is part of Holley's EFI line, which is known for its reliability, ease of installation, and compatibility with a wide range of applications.

The 558-502 harness kit comes with a complete wiring solution, including sensors, relays, and connectors necessary to integrate your LS engine with your vehicle's electrical system. The harness is designed to plug directly into the Holley 558 EFI controller, making installation straightforward and hassle-free.

One of the key features of this harness kit is its versatility. It includes various options for fuel pressure regulation, such as an adjustable pressure regulator and an adjustable fuel pressure switch. These features allow you to fine-tune your fuel system to meet the demands of your specific engine setup.

Additionally, the harness kit includes a wide range of sensors to monitor critical engine functions, such as intake air temperature, coolant temperature, and manifold absolute pressure. These sensors provide valuable data to the EFI controller, enabling it to optimize fuel delivery and ignition timing for maximum performance and efficiency.

The harness itself is constructed from high-quality, oxygen-resistant materials, ensuring that it can withstand the harsh conditions found in high-performance applications. The connectors are also designed to be robust and secure, minimizing the risk of connections coming loose during operation.

Another noteworthy feature of the 558-502 harness kit is its compatibility with various fuel systems, including returnless and return-style systems. This makes it an ideal choice for a wide range of LS engine builds.

In summary, the Holley EFI 558-502 harness kit is a comprehensive, high-performance solution for integrating your GM LS engine with your vehicle's electrical system. Its versatility, ease of installation, and robust construction make it an excellent choice for builders seeking optimal engine performance and reliability.

The Holley EFI 558-502 harness kit is designed for GM LS engines and provides a plug-and-play solution for integrating Holley's EFI system into your vehicle. Here are some potential advantages and disadvantages of purchasing this harness kit:

1. Plug-and-Play: The harness kit provides a direct connection between the Holley EFI system and the GM LS engine, making installation easier and faster compared to building a custom wiring harness.

2. Compatibility: The harness kit is specifically designed for GM LS engines, ensuring a reliable and proper connection between the various engine sensors and the EFI system.

3. Time-Saving: The harness kit eliminates the need to spend hours troubleshooting wiring issues and makes it easier to diagnose any potential problems that may arise.

4. Quality: Holley is a well-known brand in the automotive performance industry and is known for producing high-quality products.

1. Cost: The harness kit may be more expensive than building a custom wiring harness, especially for those with the necessary skills and tools.

2. Limited Flexibility: Since the harness kit is designed for specific engines and applications, it may not provide the same level of flexibility as building a custom harness.

3. Complexity: While the harness kit simplifies the installation process, it may still be complex for those who are not familiar with wiring and engine systems.

The Holley EFI 558-502 harness kit offers several advantages, including ease of installation, compatibility, time-saving, and quality. However, it also has some disadvantages, such as cost, limited flexibility, and potential complexity. Ultimately, the decision to purchase the harness kit depends on your specific needs, skills, and budget. If you value the ease and reliability of a plug-and-play solution, and have the budget for it, then the harness kit may be a good choice. Alternatively, if you have the time, skills, and desire to build a custom harness, then that may be a more cost-effective option for you.

If you are looking for a reliable and easy-to-install solution for integrating Holley EFI into your GM LS engine, then the 558-502 harness kit is a good choice. However, if you are on a tight budget or prefer a more flexible and customizable solution, then building a custom wiring harness may be a better option. Ultimately, the decision should be based on your specific needs and skills.

part # 558502 price

• $972.95

specifications injectiopug:

• brand: Holley Efi
• part type: Harness
• upc: 090127721339
• manufacturer part number: 558-502

shipping injectiopug:

• class: Standard
• carrier: UPS
• type: Fixed
• cost: $0.00
• transit: 3-5 Days
• service: UPS Ground

general injectiopug:

• Air Fuel Delivery > Fuel Injection Parts > Additional Fuel Injection Parts
• condition: New

returns injectiopug:

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

offer injectiopug:

• quantity: 7
• sold: 0
• started: May 10, 2026
• options: Ship-to-home
• availability: In Stock

payments injectiopug:

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

seller injectiopug:

• rating: 99.7%
• # reviews: 21546

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