{"product_id":"accel-shorty-spark-plug-8199-hp-copper-8-pack-5-8-hex-14mm-threads","title":"ACCEL Shorty Spark Plug 8199 HP Copper — 8-Pack, 5\/8\" Hex \u0026 14mm Threads","description":"\u003cb\u003eThe ACCEL 8199 HP Copper Shorty spark plug is a compact, high-performance copper-core plug designed to fit tight header clearance while delivering stronger, hotter sparks for better throttle response.\u003c\/b\u003e\n\nThe ACCEL 8199 HP Shorty is engineered for engines where standard-length plugs interfere with exhaust manifolds or tubular headers. Its reduced overall length avoids denting headers and burning spark plug boots, yet retains the electrical and thermal properties needed for high-rpm performance. These plugs are built with a copper core for superior heat transfer and machine-rolled 14mm threads to protect cylinder head integrity during installation and removal.\n\n\u003ch3\u003eHow do these Shorty plugs help when space is limited?\u003c\/h3\u003e\n\u003cp\u003eWhen header tubes or tight engine bays crowd the spark plug area, the ACCEL Shorty design reduces interference and simplifies access. The shorter profile keeps plug boots clear of hot surfaces and makes it easier to get a socket or wrench onto the plug.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReduced overall length to avoid contact with headers or manifolds\u003c\/li\u003e\n  \u003cli\u003eStandard 5\/8-inch hex for easy socket compatibility\u003c\/li\u003e\n  \u003cli\u003ePrevents burned rubber boots by increasing clearance\u003c\/li\u003e\n  \u003cli\u003eMachined 14mm threads protect head surfaces during tighten\/removal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these plugs change performance or drivability?\u003c\/h3\u003e\n\u003cp\u003eACCEL's copper-core Shorty plugs promote a strong, full spark front that can improve throttle response and help maintain combustion stability at higher rpm. They are optimized to reduce fouling and misfires in demanding conditions, while still using familiar installation tools.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCopper center electrode for fast heat transfer and consistent firing\u003c\/li\u003e\n  \u003cli\u003eProjected tip to support a fuller spark discharge\u003c\/li\u003e\n  \u003cli\u003eDesigned to reduce flame dissipation and fouling under load\u003c\/li\u003e\n  \u003cli\u003eEngineers for improved transient response and smoother high-rpm power\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these plugs compatible with my vehicle and installation tools?\u003c\/h3\u003e\n\u003cp\u003eThe ACCEL 8199 HP Shorty uses a standard 5\/8\" socket size and 14mm threads, so it fits common aftermarket and OE tools and thread dimensions for many performance engines. Always verify thread pitch and reach before purchase to ensure proper fit for your cylinder head.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUses 5\/8-inch socket for universal tool compatibility\u003c\/li\u003e\n  \u003cli\u003eMachine-rolled 14mm threads to match common head specifications\u003c\/li\u003e\n  \u003cli\u003eShorter reach than OE-style plugs — check seat type and thread pitch first\u003c\/li\u003e\n  \u003cli\u003eSold as a pack of eight to service V8 and similar engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat construction and durability features should I expect?\u003c\/h3\u003e\n\u003cp\u003eThese plugs combine a copper core with durable outer materials and a projected-tip design to balance thermal control and spark energy delivery. The machine-rolled threads reduce the risk of cross-threading and make removal less likely to damage the cylinder head surface.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCopper-core center electrode for improved thermal conductivity\u003c\/li\u003e\n  \u003cli\u003eProjected tip geometry for an efficient spark path\u003c\/li\u003e\n  \u003cli\u003eMachine-rolled threads to protect head threads during service\u003c\/li\u003e\n  \u003cli\u003ePackaged as eight plugs to replace a full bank on many engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\nWho is this for\n\nThe ACCEL 8199 HP Shorty spark plug is aimed at performance enthusiasts, hot-rodders, and mechanics who need a reliable plug that fits cramped header or manifold clearances without sacrificing spark quality. If you run aftermarket tubular headers, have limited clearance around the plug wells, or want improved high-rpm combustion control in a V8-style engine, these copper-core shorty plugs offer a practical, drop-in upgrade. Always confirm thread size, seat type, and reach against your engine specifications before installing.\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these ACCEL Shorty plugs use standard sockets?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — they use a standard 5\/8-inch socket for straightforward installation with common tools.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these suitable for engines with tubular headers?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — their shorter length prevents header denting and reduces risk of burned plug boots in tight fits.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ACCEL","offers":[{"title":"Default Title","offer_id":55171332374871,"sku":"B000BWAGOW","price":73.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/accel-8199-front-packaging.jpg?v=1790442916","url":"https:\/\/britishgarage.co.uk\/products\/accel-shorty-spark-plug-8199-hp-copper-8-pack-5-8-hex-14mm-threads","provider":"British Garage","version":"1.0","type":"link"}