{"product_id":"jdmspeed-10-5mm-spark-plug-wire-set-for-hei-sbc-bbc-v8-8pc-90-boots-high-temp-silicone","title":"JDMSPEED 10.5mm Spark Plug Wire Set for HEI SBC\/BBC V8 — 8pc, 90° Boots \u0026 High-Temp Silicone","description":"\u003cp\u003e\u003cstrong\u003eJDMSPEED 10.5mm spark plug wire set is a complete replacement kit designed for HEI-equipped small- and big-block Chevrolet engines, offering high-temperature silicone insulation and 90° boots on both ends for reliable fit and consistent ignition performance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement wire set is engineered to match the firing order and reach required by most Chevrolet SBC (small block) and BBC (big block) V8 engines including popular displacements such as 302, 305, 307, 327, 350, 400, 396, 427, 454 and 502. The set includes eight wires of varying lengths to accommodate common distributor and cylinder placements and is built with a 10.5mm high-temp pure silicone outer layer that resists heat, oil, and abrasion.\u003c\/p\u003e\n\n\u003ch3\u003eWill these wires fit my HEI distributor and V8 Chevy engine?\u003c\/h3\u003e\n\n\u003cp\u003eThese wires are intended for HEI ignition systems used on most Chevrolet small- and big-block engines. Fitment depends on wire routing and boot orientation—this set uses 90° boots on both ends.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible examples: 302, 305, 307, 327, 350, 400, 396, 427, 454, 502.\u003c\/li\u003e\n  \u003cli\u003eIncludes a mix of lengths to match common factory and aftermarket layouts.\u003c\/li\u003e\n  \u003cli\u003eConfirm compatibility by comparing the provided lengths and boot angles with your stock wires before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the wire lengths and construction details?\u003c\/h3\u003e\n\n\u003cp\u003eThe kit contains eight wires cut to specific lengths to simplify installation without excess slack. Each wire has a 100% pure silicone outer insulator rated for high temperatures, plus 90° boots on both ends to clear headers and distributor towers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWire lengths: 45.9\", 40.7\", 38.4\", 36\", 28.7\", 20.1\", and three at 31.4\" for balanced routing.\u003c\/li\u003e\n  \u003cli\u003e10.5mm diameter provides reliable spark shielding and reduces crossfire risk.\u003c\/li\u003e\n  \u003cli\u003e90° boots help avoid interference with engine accessories and exhaust headers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this set help with durability and ignition reliability?\u003c\/h3\u003e\n\n\u0026gt;The pure silicone jacket resists heat, oil, and chemicals commonly found in engine bays, while the 10.5mm construction offers improved insulation and consistent spark delivery across the full operating range of classic Chevy V8s.\n\u003cul\u003e\n  \u003cli\u003eSilicone insulation tolerates high under-hood temperatures and resists cracking.\u003c\/li\u003e\n  \u003cli\u003eRobust connectors and boots ensure solid electrical contact and long life.\u003c\/li\u003e\n  \u003cli\u003eProper lengths and angles reduce stress and wear at termination points.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I check before purchasing and installing these wires?\u003c\/h3\u003e\n\n\u003cp\u003eTo avoid fitment issues, measure your current wires and note distributor cap orientation, valve cover spacing, and header clearance. This set is a universal-style replacement but not vehicle-specific—confirm lengths and the 90° boot configuration match your setup.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompare each length in the set to your existing wires for routing accuracy.\u003c\/li\u003e\n  \u003cli\u003eEnsure 90° boots clear nearby components like headers or PCV systems.\u003c\/li\u003e\n  \u003cli\u003eFollow a single-cylinder-at-a-time replacement method to keep firing order correct.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: This JDMSPEED 10.5mm HEI spark plug wire set is ideal for owners restoring or maintaining classic Chevrolet SBC and BBC V8 engines who want a durable, upgrade-quality replacement with correct lengths for typical HEI routing. It suits enthusiasts doing engine swaps, restorations, or routine tune-ups who need high-temperature silicone protection and reliable connectors without custom fabrication.\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 engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They’re made for HEI systems; non-HEI engines may require different terminals or resistances.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do the wires come with distributor or spark plug ends pre-attached?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the set includes wires with 90° boots on both ends ready to install.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"JDMSPEED","offers":[{"title":"Default Title","offer_id":48086263791774,"sku":"B06XC2ZX63","price":49.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/jdmspeed-10-5mm-front-packaging.jpg?v=1785892753","url":"https:\/\/northtrailauto.ca\/products\/jdmspeed-10-5mm-spark-plug-wire-set-for-hei-sbc-bbc-v8-8pc-90-boots-high-temp-silicone","provider":"North Trail Auto","version":"1.0","type":"link"}