{"product_id":"accel-performance-shorty-spark-plugs-u-groove-copper-core-pack-of-8-14mm-rolled-threads","title":"ACCEL Performance Shorty Spark Plugs U-Groove Copper-Core — Pack of 8, 14mm Rolled Threads","description":"\u003cp\u003e\u003cstrong\u003eACCEL 8198 Performance U-Groove Header Spark Plugs are compact, copper-core \"Shorty\" plugs engineered to fit tight engine bays while improving high-rpm ignition performance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your spark plug boots sit uncomfortably close to exhaust manifolds or headers, the ACCEL 8198 shorty design prevents boot burning and header dents by shortening the plug body without sacrificing spark energy. These copper-core plugs offer higher thermal conductivity and are machined with rolled 14mm threads to protect cylinder heads; they accept a standard 5\/8\" socket for easier installation in cramped areas. Packaged as a set of eight, they’re intended for performance-minded builds where space constraints and reliable high-rpm ignition are priorities.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these shorty plugs help when space around headers is limited?\u003c\/h3\u003e\n\u003cp\u003eThe shortened insulator and compact shell reduce the plug’s overall height so boots and ignition wires clear exhaust headers or manifolds. That lowers the risk of melted boots and avoids denting or contact with hot metal surfaces during installation or operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReduced plug body length for tighter clearances\u003c\/li\u003e\n  \u003cli\u003eStandard 5\/8\" hex for common socket access\u003c\/li\u003e\n  \u003cli\u003ePrevents boot overheating and header interference\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance differences can I expect from ACCEL 8198 plugs?\u003c\/h3\u003e\n\u003cp\u003eThese plugs use a copper core and U-groove electrode to produce a pronounced, fuller spark front that supports quicker throttle response and stronger ignition at higher RPMs. They are designed to reduce fouling and flame dissipation versus some OE designs, helping maintain stable combustion in demanding conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCopper core increases thermal conductivity for consistent spark\u003c\/li\u003e\n  \u003cli\u003eU-groove electrode encourages a larger, hotter spark front\u003c\/li\u003e\n  \u003cli\u003eEngine responsiveness and combustion stability at elevated RPMs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these plugs easy to install and safe for my cylinder heads?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward: the ACCEL 8198 accepts a common 5\/8\" socket, and the machine-rolled 14mm threads are engineered to minimize thread stress and protect head integrity during tightening and removal. Their design simplifies access in confined engine bays, reducing the chance of cross-threading or difficulty when changing plugs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMachine-rolled 14mm threads for head protection\u003c\/li\u003e\n  \u003cli\u003eStandard socket size for easy removal and installation\u003c\/li\u003e\n  \u003cli\u003eLess chance of boot damage during service in tight spaces\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat maintenance or application notes should I follow?\u003c\/h3\u003e\n\u003cp\u003eUse the ACCEL 8198 plugs where the shorter physical profile is required and match the plug heat range and gap specifications to your engine’s needs. Periodic inspection for fouling or electrode wear is recommended; replace as part of routine tune-ups or at the intervals suggested by your vehicle or engine builder.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConfirm correct heat range and gap before installation\u003c\/li\u003e\n  \u003cli\u003eInspect boots and wires for fit and clearance with headers\u003c\/li\u003e\n  \u003cli\u003eReplace according to engine maintenance schedule\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The ACCEL 8198 Performance U-Groove Header Spark Plug — pack of eight — is suited for mechanics, hot-rodders, and vehicle owners upgrading ignition in engines with restricted clearance near exhaust components. It’s a practical choice for performance builds that need a compact plug with a copper core and durable threaded design, especially when reliable high-rpm ignition and easier serviceability in tight spaces are priorities.\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: Will ACCEL 8198 fit engines with tight header clearance?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the shorty profile reduces plug height so boots clear headers and manifolds in confined engine bays.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What socket size do these plugs use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They use a standard 5\/8\" socket and have machine-rolled 14mm threads for easier installation and head protection.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ACCEL","offers":[{"title":"Default Title","offer_id":48083950502046,"sku":"B000BW8NYC","price":94.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/accel-8198-front-packaging.jpg?v=1785840989","url":"https:\/\/northtrailauto.ca\/products\/accel-performance-shorty-spark-plugs-u-groove-copper-core-pack-of-8-14mm-rolled-threads","provider":"North Trail Auto","version":"1.0","type":"link"}