Description
Spark plug indexing is a precision tuning technique that positions the ground electrode for optimal flame kernel development and combustion efficiency. These Allstar Performance index shims allow you to dial in the exact electrode angle your engine needs, which translates to improved ignition reliability, better fuel economy, and measurable gains in power output across your RPM range. Whether you’re running a naturally aspirated or forced induction setup, having the right shim selection on hand eliminates guesswork and ensures repeatability in your tune.
- 14mm flat seat
- 60-degree shim included
- 90-degree shim included
- Set of 24 pieces
- Stainless steel construction
- Bolt-on installation
- Universal fitment
- CNC-precision manufactured
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