Champion Spark Plug C53VC
14mm thread, .750" reach, Copper+
5/8" Hex, Surface Gap. Extremely Cold.
This surface gap style plug positions the spark approximately 1/16 inch into the combustion chamber with no exposed ground electrode. This helps expose the spark to the mixture and protects against pre-ignition from an overheated ground electrode.
The surface gap style runs too cold to burn away fouling deposits. Accurate fuel/air mixture is critical, and a high-performance ignition system is required. This plug is used in NASCAR engines.