Spark Plug Index Shims 14mm Small O.D.

The Spark Plug Index Shims 14mm Small O.D. by ALLSTAR PERFORMANCE are precision spacers designed for mechanics working with high-performance engine builds. These shims address ignition timing and spark plug seating challenges, allowing for fine-tuning of spark plug positioning without the need for costly modifications.

Crafted from aluminum alloy, these shims provide a compact design that fits standard spark plug thread wells while allowing for controlled depth adjustment. They can be used individually or stacked to achieve the desired spark plug depth, ensuring proper sealing and preventing gas leakage around the spark plug.

These shims are particularly beneficial for professionals and serious enthusiasts engaged in custom engine development, vintage restorations, and competitive motorsports applications where precise ignition timing is crucial for performance optimization.