Spark Plug Gapper

The ALLSTAR PERFORMANCE Spark Plug Gapper (ALL 96516) is an essential precision tool for engine builders, mechanics, and automotive enthusiasts who demand accuracy in ignition system setup. Proper spark plug gap is critical to engine performance—too wide and ignition becomes unreliable; too narrow and fuel economy and power suffer. This handheld gapper provides the repeatability and control needed to set gaps to exact specifications, whether you're tuning a stock engine or dialing in a high-compression build.

Engineered by ALLSTAR PERFORMANCE, a trusted name in precision automotive tooling, this gapper features a durable construction designed to handle repeated use without wear or calibration drift. The tool accommodates a wide range of plug types and electrode geometries, making it compatible with most conventional spark plugs across domestic and import platforms. The mechanical design allows for incremental gap adjustment with tactile feedback, ensuring you achieve the exact gap dimension your engine specification calls for.

Compact at just 4.05 inches long and weighing only 0.26 lbs, it fits easily in any tool bag or workbench and is built to deliver consistent results across thousands of adjustments. This gapper is indispensable for serious engine tuning—from street performance builds to routine maintenance and competition prep, where ignition consistency directly impacts horsepower and reliability.