{"product_id":"sparkwhiz-uf271-square-ignition-coil-kit-with-748ee-8mm-wires-and-spark-plugs-8-cylinder-oem-fit-copper-wound-durability","title":"SPARKWHIZ UF271 Square Ignition Coil Kit with 748EE 8mm Wires and Spark Plugs — 8-Cylinder OEM-Fit, Copper-Wound Durability","description":"\u003cstrong\u003eSPARKWHIZ UF271 Square Ignition Coils paired with 748EE high-performance ignition wires and plug set replace worn ignition components to restore reliable spark and smoother engine performance.\u003c\/strong\u003e\n\n\u003cp\u003eIf your GM truck, SUV, or compatible marine engine is misfiring, stumbling at idle, or showing reduced throttle response, the ignition system can often be the cause. This complete SPARKWHIZ kit includes square UF271 (D581) coil packs, eight 8mm 748EE spark plug wires, and eight spark plugs — a direct-replacement bundle intended to match OEM fitment where the square coil style is specified. The kit is built for durability with copper-wound coils and reinforced insulation on wires to withstand heat, vibration, and everyday driving demands.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these UF271 square coils improve engine reliability?\u003c\/h3\u003e\n\u003cp\u003eReplacing aging coil packs can stop intermittent misfires and rough idle without expensive diagnostics. The UF271 design uses a robust copper winding and polyester rubber over-molding to resist heat and moisture that degrade ignition output.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect-fit square coil (UF271\/D581) for compatible GM engines\u003c\/li\u003e\n  \u003cli\u003eCopper winding for consistent spark energy\u003c\/li\u003e\n  \u003cli\u003eDurable rubber housing to reduce moisture intrusion\u003c\/li\u003e\n  \u003cli\u003eHelps stabilize idle and reduces pulse misfires\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy include 748EE 8mm wires and plugs with the coil pack?\u003c\/h3\u003e\n\u003cp\u003eIgnition components often wear as a set; changing only one part can leave older parts to fail soon after. This bundle replaces coil, wires, and plugs together to ensure ignition timing and spark transfer are uniform across all cylinders.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e8mm wires provide solid insulation and low-resistance path for spark\u003c\/li\u003e\n  \u003cli\u003eSpark plugs matched to wire and coil output for optimal firing\u003c\/li\u003e\n  \u003cli\u003eFull eight-cylinder kit avoids mismatched aging components\u003c\/li\u003e\n  \u003cli\u003eIncludes installation-ready pieces for quicker service\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and engines are these parts compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis UF271 coil set and wire\/plug kit targets a broad range of GM cars, trucks, SUVs, and selected marine engines that specify the square coil style. Always verify the coil shape in your engine bay—square vs. round—before ordering to avoid fitment issues.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eChevrolet: Avalanche, Silverado, Tahoe, Express, SSR, Suburban, Monte Carlo, Sonora, Trailblazer (specified years)\u003c\/li\u003e\n  \u003cli\u003eGMC: Envoy XL, Sierra 1500 (including Classic), Savana, Hummer H2\u003c\/li\u003e\n  \u003cli\u003eMercruiser marine engines (selected 2001–2007 models)\u003c\/li\u003e\n  \u003cli\u003eCross-references: UF271, D581, and several OEM numbers listed for verification\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow simple is the swap, and what should I check during installation?\u003c\/h3\u003e\n\u003cp\u003eFor a competent DIYer with basic hand tools, swapping coils, wires, and spark plugs is straightforward, but take care to match cylinder order and routing. Inspect mounting points, torque plugs to spec, and confirm electrical connectors seat firmly on the new coils.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDouble-check coil shape in engine bay before purchasing\u003c\/li\u003e\n  \u003cli\u003eLabel or photograph old wire routing to maintain correct firing order\u003c\/li\u003e\n  \u003cli\u003eTorque spark plugs per manufacturer specification to avoid damage\u003c\/li\u003e\n  \u003cli\u003eReconnect coil electrical plugs fully and test for misfire codes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The SPARKWHIZ UF271 square coil and 748EE wire plus plug kit is for owners and mechanics of older GM trucks, SUVs, and compatible marine engines who need a complete ignition refresh. It suits people aiming to remedy intermittent misfires, poor idle, decreased drivability, or who prefer replacing ignition components as a matched set for long-term reliability. If your vehicle uses the square-style UF271\/D581 coils and you want OEM-style fitment with durable materials, this kit is a practical, cost-effective solution.\u003c\/p\u003e\n\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 UF271 coils the square or round style?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: This listing is for the square UF271\/D581 coils. Verify coil shape in your engine compartment before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this set fit my 2005 Chevrolet Silverado?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Many 1999–2007 Silverado models use UF271 square coils; confirm year and coil shape for your specific engine.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SPARKWHIZ","offers":[{"title":"Default Title","offer_id":48080443113630,"sku":"B0DSZLR6L8","price":184.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/sparkwhiz-uf271-coil-pack-front.jpg?v=1785781369","url":"https:\/\/northtrailauto.ca\/products\/sparkwhiz-uf271-square-ignition-coil-kit-with-748ee-8mm-wires-and-spark-plugs-8-cylinder-oem-fit-copper-wound-durability","provider":"North Trail Auto","version":"1.0","type":"link"}