Description
When you’re pushing your engine to the limit on the track, spark plug reliability becomes non-negotiable. The Racing Spark Plug AR3931 delivers consistent ignition performance under high RPM and extreme combustion conditions, eliminating misfire risk during critical moments. Built for dedicated racers who demand precision ignition without compromise.
- 14 mm thread
- 0.750 in reach
- Gasket seat design
- Non-resistor construction
- Sold individually
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