Performance Series Spark Plugs - A/C .460" reach, 5/8" hex, tapered

These are the most commonly usedperformance plugs today! These are a stock replacement for Mercruiser BBC and SBC motors.

Note: colder plugs work best in supercharged applications andwarmer plugs in general performance uses. Mostcast iron cylinder heads use tapered spark plugwhile most aluminum heads use a gasket style plug.