Holley EFI's universal "cut-to-fit" spark plug wire set is built for GM LS engines running Holley Smart Coils. Each wire ships with the spark plug terminal and boot pre-installed, while the coil end is left unterminated with the boot and terminal included so you can trim to the length your install needs.
Specifications:
- Application: GM LS (Gen III/IV), Holley Smart Coil
- Wire Diameter: 8.2mm
- Resistance: 350 ohms per foot
- Boot Color: Red wire with gray, 180-degree coil-end boots
- Boot Material: Silicone
- Length: 36" unterminated for custom routing
- Terminals: Locking dual-crimp style
- Part Number: 561-115
FAQ
What coil is this wire set designed for?
It's designed for GM LS engines running Holley's Smart Coil, using a 180-degree coil-end boot.
Why is the coil end unterminated?
The 36" unterminated coil end lets you trim each wire to the exact length your install needs, then crimp on the included terminal.
What is the resistance rating?
These wires offer 350 ohms per foot, meeting or exceeding OE resistance specs while maintaining strong noise suppression.
What colors are available?
This set is available in red wire with gray boots; black and gray wire options are also offered in the Holley EFI spark plug wire lineup.

