ACCEL Performance U-Groove Shorty Spark Plugs - Pack of 8, Copper Core & 14mm Threads

These "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.

How do these shorty plugs help in cramped engine bays?

Shorter 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.

• Reduced overall length to clear close-fitting headers
• Prevents plug boot overheating and deterioration
• Designed for easier access with limited clearance

What performance benefits can I expect at high RPM?

ACCEL 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.

• Larger, fuller spark for improved flame propagation
• Reduced misfire and less flame dissipation at high revs
• Noticeable improvement in throttle response and power feel

What materials and design features ensure reliability?

Each 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.

• Copper-core center for improved heat transfer
• Machine-rolled 14mm threads to preserve head integrity
• Standard 5/8" socket compatibility for easy maintenance

How many plugs are included and what applications suit this pack?

This 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.

• Pack of eight—covers full V8 installations
• Fits engines needing compact plug profiles
• Great for performance upgrades and tight-fit repairs

Who 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.