{"product_id":"accel-performance-u-groove-shorty-spark-plugs-pack-of-8-copper-core-14mm-threads","title":"ACCEL Performance U-Groove Shorty Spark Plugs - Pack of 8, Copper Core \u0026 14mm Threads","description":"\u003cstrong\u003eACCEL 8198 Performance U-Groove Shorty spark plugs are compact, copper-core plugs engineered to fit tight engine bays while improving high-rpm power and throttle response.\u003c\/strong\u003e\n\n\u003cp\u003eThese \"shorty\" spark plugs from ACCEL are made for engines where clearance between plug boots and exhaust headers or manifolds is limited. Their reduced overall length prevents plug-boot damage and header dents, while still offering a stronger, hotter spark than many factory replacements. Built with a copper core and machine-rolled 14mm threads, they balance heat transfer, durability, and straightforward installation using a common 5\/8\" socket. This listing is for a pack of eight plugs—ideal for V8 engines or full-set replacements.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these shorty plugs help in cramped engine bays?\u003c\/h3\u003e\n\u003cp\u003eShorter reach and compact construction let you install or remove plugs where standard plugs would foul against headers or tight wire routing. The condensed design reduces the chance of burning plug boots and prevents contact damage with exhaust components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReduced overall length to clear close-fitting headers\u003c\/li\u003e\n  \u003cli\u003ePrevents plug boot overheating and deterioration\u003c\/li\u003e\n  \u003cli\u003eDesigned for easier access with limited clearance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance benefits can I expect at high RPM?\u003c\/h3\u003e\n\u003cp\u003eACCEL engineered these plugs to produce a larger, hotter spark front than many OE equivalents, which supports stronger combustion at high engine speeds. Users typically find improved throttle responsiveness and more consistent power delivery under load.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLarger, fuller spark for improved flame propagation\u003c\/li\u003e\n  \u003cli\u003eReduced misfire and less flame dissipation at high revs\u003c\/li\u003e\n  \u003cli\u003eNoticeable improvement in throttle response and power feel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and design features ensure reliability?\u003c\/h3\u003e\n\u003cp\u003eEach plug uses a copper core to enhance thermal conductivity, helping manage heat and reduce fouling. Machine-rolled 14mm threads protect cylinder heads by forming stronger engagement than cut threads, and the plugs accept a standard 5\/8\" socket for simple servicing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCopper-core center for improved heat transfer\u003c\/li\u003e\n  \u003cli\u003eMachine-rolled 14mm threads to preserve head integrity\u003c\/li\u003e\n  \u003cli\u003eStandard 5\/8\" socket compatibility for easy maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow many plugs are included and what applications suit this pack?\u003c\/h3\u003e\n\u003cp\u003eThis listing contains eight ACCEL 8198 plugs, making it suitable for complete replacement on many V8 engines or for keeping a full spare set on hand. Because of the shorty design, they’re especially useful for performance cars, classic restorations, or any vehicle where header proximity is an issue.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePack of eight—covers full V8 installations\u003c\/li\u003e\n  \u003cli\u003eFits engines needing compact plug profiles\u003c\/li\u003e\n  \u003cli\u003eGreat for performance upgrades and tight-fit repairs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The ACCEL 8198 U-Groove Shorty spark plugs are aimed at enthusiasts, mechanics, and DIYers who need a reliable plug that clears tight exhaust components without sacrificing spark intensity. Choose these plugs if you want easier access in confined engine bays, better high-RPM combustion, and a full eight-plug set for V8 or complete replacements.\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: Can I use a standard 5\/8\" socket to install these plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the ACCEL 8198 plugs accept a standard 5\/8\" socket for installation and removal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these plugs suitable for high-RPM performance engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, they produce a larger, hotter spark intended to improve combustion and reduce misfire at high RPM.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ACCEL","offers":[{"title":"Default Title","offer_id":55169050280279,"sku":"B000BW8NYC","price":80.54,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/accel-8198-front-view-pack-of-eight.jpg?v=1790417604","url":"https:\/\/britishgarage.co.uk\/products\/accel-performance-u-groove-shorty-spark-plugs-pack-of-8-copper-core-14mm-threads","provider":"British Garage","version":"1.0","type":"link"}