Details: Denso Spark Plug Denso's standard plugs have always offered a patented U-groove ground electrode producing for a larger, hotter spark. Copper core for better thermal conductivity. Machine rolled threads to reduce cross-threading and seizing . The plug insulator is constructed of purified alumina powder for extreme stress with 5 ribs to prevent flashover.
COMPARES TO: AUTOLITE 258, BOSCH WS8E AND NGK BM4A
COMPARES TO: AUTOLITE 258, BOSCH WS8E AND NGK BM4A
