• Not For LS1 or LS6

Holley 558-3321 Factory Replacement Ignition Coil Harness Features:

• OEM connectors
• Techflex F6 braided wire looms
• Replace damaged factory harnesses
• Works with Holley EFI main harnesses with coil on plug connectors
• Completely plug and play

FAQ

Are LS coil packs interchangeable?

• Yes, within the same generation of LS engines.
• Ensure compatibility with plug style & wiring.
• The Holley LS coil harness (558-321) facilitates seamless swaps.

Are OEM coil packs better than aftermarket?

• Depends on specific requirements.
• OEM offers reliability; aftermarket may enhance performance.
• Consider factors like budget and desired outcomes.

Do you need a tune for upgraded coil packs?

• Not necessarily, unless other major modifications.
• Tune may optimize performance but isn't mandatory.
• Holley coil harness (558-321) helps integrate upgrades.

Do upgraded coil packs increase horsepower?

• Minimal direct HP gain; improve ignition consistency.
• Enhanced spark may support power delivery.
• Consider a comprehensive setup with Holley 558-321.

Understanding the role of coil packs and harnesses like Holley LS coil harness (558-321) aids in optimizing LS engine performance without compromising compatibility.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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