{"product_id":"rlp-spark-plug-wire-set-for-ford-small-block-v8-8-0mm-blue-8-wires-coil-wire-small-cap-hei-fit","title":"RLP Spark Plug Wire Set for Ford Small Block V8 — 8.0mm Blue, 8 Wires + Coil Wire, Small-cap HEI Fit","description":"\u003cp\u003e\u003cstrong\u003eRLP'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.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf 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.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these wires improve ignition reliability?\u003c\/h3\u003e\n\u003cp\u003eBy 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSpiral-core conductor for stable high-voltage transmission\u003c\/li\u003e\n  \u003cli\u003eLow-resistance stainless steel and brass terminals for improved conductivity\u003c\/li\u003e\n  \u003cli\u003eThick 8.0mm silicone jacket to shield the core from heat and chemicals\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these fit my Ford Small Block with a small-cap HEI distributor?\u003c\/h3\u003e\n\u003cp\u003eYes — 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes eight plug wires plus one coil wire for external-coil systems\u003c\/li\u003e\n  \u003cli\u003eNot suitable for HEI distributors that contain an internal coil\u003c\/li\u003e\n  \u003cli\u003eCoil wire compatible with HEI distributors that use a male terminal cap\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and protection features are included?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeavy-duty silicone boots for heat and oil resistance\u003c\/li\u003e\n  \u003cli\u003e8.0mm silicone outer jacket guarding the core against abrasion\u003c\/li\u003e\n  \u003cli\u003eKevlar-wrapped spiral core for mechanical resilience and longevity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know before ordering and installing?\u003c\/h3\u003e\n\u003cp\u003eConfirm 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck distributor cap style and coil placement prior to purchase\u003c\/li\u003e\n  \u003cli\u003eMatch firing order and avoid tight bends to maintain wire integrity\u003c\/li\u003e\n  \u003cli\u003eSet screws or boots should seat fully to ensure good terminal contact\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho 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.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these wires compatible with an HEI distributor that has a built-in coil?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The included coil wire is for external ignition coils only and will not work with HEI distributors that contain a built-in coil.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these plug wires reduce radio interference and engine misfire?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The spiral core and high EMI\/RFI suppression design minimize interference and support more consistent spark delivery.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RLP","offers":[{"title":"Default Title","offer_id":48083062915230,"sku":"B0DG8P2CQV","price":52.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/rlp-spark-plug-wires-front-view.jpg?v=1785823353","url":"https:\/\/northtrailauto.ca\/products\/rlp-spark-plug-wire-set-for-ford-small-block-v8-8-0mm-blue-8-wires-coil-wire-small-cap-hei-fit","provider":"North Trail Auto","version":"1.0","type":"link"}