RLP Spark Plug Wire Set for Ford Small Block V8 — 8.0mm Blue, 8 Wires + Coil Wire, Small-cap HEI Fit

RLP's blue 8.0mm spark plug wire set is a complete replacement harness — eight plug leads plus a coil wire — engineered to restore reliable high-voltage delivery for Ford Small Block V8 engines (221, 260, 289, 302) using a small-cap HEI distributor.

If your classic Ford V8 is misfiring, running rough, or showing weak throttle response, worn or damaged plug wires are often the culprit. These high-tension leads are built with a spiral-core conductor, heavy-duty 8.0mm silicone jacket, and high-temperature silicone boots to resist heat, oil, and contaminants while suppressing electrical interference for consistent spark delivery.

How do these wires improve ignition reliability?

By using a spiral-wound core and low-resistance terminals, the set reduces energy loss between the coil and the plug. That ensures stronger, more consistent sparks across all cylinders under load and high rpm.

• Spiral-core conductor for stable high-voltage transmission
• Low-resistance stainless steel and brass terminals for improved conductivity
• Thick 8.0mm silicone jacket to shield the core from heat and chemicals

Will these fit my Ford Small Block with a small-cap HEI distributor?

Yes — the wiring layout and terminals are designed for Ford Small Block engines using small-cap HEI distributors in 221, 260, 289, and 302 displacements. Verify whether your distributor accepts an external coil and has a male terminal cap before installing.

• Includes eight plug wires plus one coil wire for external-coil systems
• Not suitable for HEI distributors that contain an internal coil
• Coil wire compatible with HEI distributors that use a male terminal cap

What materials and protection features are included?

The set combines durable silicone boots, a reinforced silicone jacket, and a Kevlar-protected spiral core to survive the heat and chemical exposure common in engine bays. These materials also help suppress EMI/RFI to avoid radio noise and misfires caused by interference.

• Heavy-duty silicone boots for heat and oil resistance
• 8.0mm silicone outer jacket guarding the core against abrasion
• Kevlar-wrapped spiral core for mechanical resilience and longevity

What should I know before ordering and installing?

Confirm your distributor type and whether your ignition setup uses an external coil. The included coil wire only works with external-coil systems and male-cap HEI distributors. Installation is straightforward but keep cylinder firing order and proper routing in mind to prevent crossfire.

• Check distributor cap style and coil placement prior to purchase
• Match firing order and avoid tight bends to maintain wire integrity
• Set screws or boots should seat fully to ensure good terminal contact

Who this fits: This RLP wire set is aimed at classic Ford owners, restorers, and performance hobbyists who need a reliable, OEM-style replacement for their Small Block V8 running a small-cap HEI distributor and external coil. It’s suitable for weekend drivers and track-day tuners who want improved ignition consistency without changing their stock ignition architecture. The set ships new and includes a 12-month warranty and customer support for fitment questions or post-sale assistance.