Spark Plug Index Tool

The Spark Plug Index Tool (ALL 96510) is a specialized precision instrument designed for engine technicians and automotive enthusiasts who require accurate spark plug gap indexing and alignment. This 14mm flat and tapered plug indexer combines durable plastic construction with a compact, ergonomic design that fits securely in any technician's toolkit. The tool measures 17.05 inches in length, providing extended reach and leverage for consistent, repeatable spark plug indexing operations across both domestic and import vehicle platforms.

Proper spark plug indexing is critical for optimizing combustion efficiency and engine performance. This indexer accommodates both 14mm flat and tapered plug designs, the most common configurations in modern automotive engines. The black plastic construction resists corrosion from shop environments and engine bay contamination, while the lightweight design at 0.54 lbs minimizes fatigue during extended diagnostic or tuning sessions. The tool's 4.1-inch working width ensures stable contact with plug electrodes without marring or damage, a key consideration when working with precision-gapped plugs that demand repeatability across multiple cylinder heads.

This spark plug indexer is essential for engine builders, tuning shops, and serious DIY technicians preparing engines for maximum combustion performance. Whether setting up a high-performance fuel injection system, preparing an engine for forced induction, or maintaining optimal ignition characteristics on stock powerplants, proper plug indexing directly impacts cold start behavior, fuel economy, and peak horsepower delivery. The ALL 96510 serves shops and individuals who understand that gap consistency and electrode alignment are foundational to reliable engine operation.

Spark plug indexing remains a proven technique in engine optimization, with applications ranging from street vehicles to competition motorsports. Having a dedicated, precision indexing tool in your shop or garage ensures every spark plug installation contributes to predictable engine behavior and longevity.