{"product_id":"rlp-8-5mm-universal-spark-plug-wire-set-for-chevy-v8-hei-9-piece-red-spiral-core-silicone-jackets","title":"RLP 8.5mm Universal Spark Plug Wire Set for Chevy V8 HEI — 9-Piece Red, Spiral Core \u0026 Silicone Jackets","description":"\u003cb\u003eRLP 8.5mm Universal Spark Plug Wire Set is a complete 9-piece high-tension lead kit designed for HEI-equipped Chevy small- and big-block V8 engines.\u003c\/b\u003e\n\n\u003cp\u003eThis RLP kit supplies eight spark plug wires plus a coil lead built with 8.5mm spiral-wound cores, tightly woven fiberglass braids and heavy-duty silicone jackets to resist heat, oil and abrasion. The set is engineered to fit many Chevy SBC and BBC HEI systems (including popular displacements such as 305, 327, 350, 427, 454 and 502) and includes 90-degree boots and durable terminals for reliable spark transfer.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this wire set improve ignition consistency?\u003c\/h3\u003e\n\u003cp\u003eThe spiral-wound core and high dielectric insulator limit energy loss and help maintain a steady voltage path from coil to plug. Durable silicone jackets and braided fiberglass reinforce the insulation to protect against heat and environmental wear over time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e8.5mm spiral wound core reduces energy leakage\u003c\/li\u003e\n  \u003cli\u003eHigh-dielectric insulator preserves voltage integrity\u003c\/li\u003e\n  \u003cli\u003eFiberglass braid and silicone jacket shield against heat and oil\u003c\/li\u003e\n  \u003cli\u003eStainless steel\/brass terminals ensure consistent conductivity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these wires fit my Chevy HEI small-block or big-block engine?\u003c\/h3\u003e\n\u003cp\u003eThis universal kit is made for HEI distributors on a wide range of SBC and BBC Chevy engines. It covers many factory and aftermarket V8 displacements, so it’s a practical replacement for common performance and routine-service applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with SBC: 302, 305, 307, 327, 350, 400\u003c\/li\u003e\n  \u003cli\u003eCompatible with BBC: 348, 366, 396, 402, 409, 427, 454, 496, 502, 572, 632\u003c\/li\u003e\n  \u003cli\u003eIncludes 8 plug wires plus 1 coil lead for HEI systems\u003c\/li\u003e\n  \u003cli\u003eFeatures black 90° boots on both ends for common HEI routing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and construction details matter for durability?\u003c\/h3\u003e\n\u003cp\u003eLong service life depends on heat resistance, abrasion protection and terminal quality. RLP uses heavy silicone jackets over tightly woven fiberglass braids, combined with a spiral-wound core and quality metal terminals to deliver that combination of resistance and conductivity.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeavy-duty silicone jackets resist heat, oil and abrasion\u003c\/li\u003e\n  \u003cli\u003eFiberglass braid provides mechanical protection and insulation\u003c\/li\u003e\n  \u003cli\u003eSpiral-wound core with high dielectric strength for voltage control\u003c\/li\u003e\n  \u003cli\u003eStainless steel and brass terminals for reliable connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the package and what warranty is offered?\u003c\/h3\u003e\n\u003cp\u003eThe RLP kit ships as a nine-piece package: eight spark plug leads plus a single coil wire sized for HEI systems. The product is new, packed for shipping, and backed by a 12-month warranty covering defects in materials and workmanship.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e9-piece kit: 8 plug wires + 1 coil lead\u003c\/li\u003e\n  \u003cli\u003eBlack 90° boots on each lead for standard HEI fitment\u003c\/li\u003e\n  \u003cli\u003ePackaged new and inspected to quality standards\u003c\/li\u003e\n  \u003cli\u003e12-month warranty with replacement or refund option\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The RLP 8.5mm Universal Spark Plug Wire Set is suited for mechanics, restorers and performance hobbyists who want a robust, HEI-compatible replacement for Chevy small- and big-block V8s. It’s useful whether you’re doing routine tune-ups, rebuilding a classic V8, or upgrading an older ignition system where improved insulation and dependable terminals are desired. Avoiding mismatched terminals and ensuring proper routing will give the best results; consult vehicle specifications or a service manual when confirming fitment for niche engine variants.\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 non-HEI Chevy distributors?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: This kit targets HEI systems; non-HEI distributors may need different boots or terminal styles—check distributor type before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use these wires for high-compression or boosted engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They’re designed for higher heat and voltage environments, but verify fitment and clearances for forced-induction or extreme builds.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RLP","offers":[{"title":"Default Title","offer_id":55167329763671,"sku":"B0B28C17PY","price":45.13,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/rlp-front-packaging-wire-set.jpg?v=1790383686","url":"https:\/\/britishgarage.co.uk\/products\/rlp-8-5mm-universal-spark-plug-wire-set-for-chevy-v8-hei-9-piece-red-spiral-core-silicone-jackets","provider":"British Garage","version":"1.0","type":"link"}