Champion (821) L77JC4 Marine Plug Spark Plug, Pack of 1

Cut back ground electrode for small block Chevy, Ford and select marine applications. The ground electrode is cut back from the center electrode 0.40-inch. The ground electrode face is concave around the center electrode to provide a constant gap. Constructed with a nickel shell for faster heat dissipation and copper core or double copper (when noted) for further heat removal, all are non-resistor except where noted with special Q-type resistor.