Spark Plug Indexer 9 Hole w/ Rotatable Insert

The Spark Plug Indexer 9 Hole with Rotatable Insert from Jones Racing Products is a precision ignition timing tool designed for high-performance marine and automotive engines. This indexer is suitable for various engine types, allowing users to optimize spark plug positioning for maximum combustion efficiency. Whether tuning a V8 outboard, inboard powerplant, or performance street application, this tool is essential for serious boaters and engine builders.

Engineered with precision tolerances, the nine-hole design features a rotatable insert that provides nine distinct indexing positions. This allows for fine-tuned control over plug firing angle relative to piston travel and cylinder geometry. The rotatable insert mechanism ensures that users can lock in their chosen position confidently, delivering repeatable setups across multiple cylinders or future engine work.

Boaters upgrading to hotter ignition systems, marine mechanics optimizing fuel efficiency, and engine builders pursuing peak horsepower can all benefit from this tool. Its compact footprint and lightweight design make it easy to handle and store in your engine bay or service kit without adding bulk. The Spark Plug Indexer is a reliable choice for anyone looking to enhance engine performance.