558-312 HOLLEY Ignition Coil Harness

Review HOLLEY Ignition Coil Harness

The Holley 558-312 Ignition Coil Harness is an essential component for any performance enthusiast seeking to upgrade their ignition system. Designed for use with Holley's 6-71 and 8-78 carburetors, this harness is engineered to deliver reliable and consistent spark to your engine.

The ignition coil harness is constructed with high-quality, red and black, 12-gauge wiring. The red wires carry the primary ignition power to the distributor while the black wires provide the ground. Each wire end is terminated with a securely crimped and insulated bullet connector, ensuring a snug and reliable fit to the corresponding terminal.

This harness also includes an integrated ignition coil. The Holley 2AL Performance Ignition Coil, which is included, is designed to provide a strong and consistent spark for improved combustion efficiency. It features a robust design with a high-temperature insulation system and a gold-plated spark plug terminal for optimal conductivity.

Installing the Holley 558-312 Ignition Coil Harness is a straightforward process. The harness comes with clear and concise instructions, making it easy for even the most novice of DIYers to complete the installation. Additionally, the use of bullet connectors simplifies the wiring process, reducing the likelihood of connection errors.

In summary, the Holley 558-312 Ignition Coil Harness is an excellent upgrade for any carbureted engine seeking improved ignition performance. With its high-quality wiring, reliable bullet connectors, and integrated Holley 2AL Performance Ignition Coil, this harness is sure to provide consistent and robust spark for optimal engine performance.

The Holley 558-312 ignition coil harness is a popular aftermarket solution for classic car and hot rod applications. Here are some potential pros and cons to consider before making a purchase:

1. Easy to Install: The plug-and-play design of the Holley 558-312 harness makes it a straightforward installation process. It eliminates the need for custom wiring and may save time and effort compared to a factory harness.

2. Reliable: Holley is known for producing high-quality automotive components, and the ignition coil harness is no exception. It offers a reliable solution for providing power to the ignition coils and distributor.

3. Versatile: This harness is compatible with a wide range of applications, from small-block Chevrolets to Ford flathead engines, making it a versatile choice for many different projects.

4. Affordable: Compared to OEM harnesses, aftermarket alternatives like the Holley 558-312 harness can be more cost-effective.

1. Limited Customization: Since it is a plug-and-play harness, there is little room for customization. If you have specific wiring requirements or need to modify the harness to fit your application, this may not be the best choice.

2. Compatibility Concerns: While the Holley 558-312 harness is compatible with a broad range of engines, it may not work with every single application. It's essential to double-check the compatibility before making a purchase to ensure a proper fit.

3. Limited Spark Plug Wires: Some users have reported that the included spark plug wires may not be long enough for certain applications. It might be necessary to purchase additional wires separately.

The Holley 558-312 ignition coil harness offers a reliable, easy-to-install, and versatile solution for providing power to ignition coils and distributors in various classic car and hot rod applications. However, its limited customization options and potential compatibility concerns should be taken into consideration before making a purchase.

If you're looking for a plug-and-play ignition coil harness for a common application and don't require extensive customization, the Holley 558-312 harness may be an excellent choice. However, if you have unique wiring requirements or need a more customized solution, it might be worth exploring other options or consulting with a professional automotive electrician.

Details:

Holley ignition coil harness. Meticulously crafted to OE-specific standards. Its OE-standard design provides the right fit and solution to your vehicle needs. Holley offers top-quality replacement parts for the automotive aftermarket.

Offers unmatched quality at an price. Strict OE requirements in fitment and functionality ensure part is reliable performance. Brand new in the box - fit and quality guaranteed.

specifications ignitioncomp:

• brand: Holley
• mpn: 558-312
• part type: Ignition Coil Harness
• anticipated ship out time: 5-6 Business Days
• fitment type: Direct Replacement
• quantity: Sold Individually
• upc: 090127688120

payments ignitioncomp:

• credit card: visa
• wallet: google-pay
• other

offer ignitioncomp:

• options: ship-to-home
• prices: $286.95–$291.45
• item condition: New
• started: april 1, 2025
• sold #: 20
• in stock #: 5
• availability: in stock

returns ignitioncomp:

• policy: no returns

seller ignitioncomp:

• city: 48 states only, USA
• rating: 98.1%
• # reviews: 20453

general ignitioncomp:

• category: Auto Parts > Car Truck Accessories > Systems Components > Ignition Coils

shipping ignitioncomp:

• class: standard
• transit: 2-6 days
• service: standard
• type: fixed