Necessary in many high compression applications, NGK Surface Gap Spark Plugs are designed for special, high energy ignition systems.
These plugs from NGK operate over a wider heat range than ordinary spark plugs and are built to be immune to pre-ignition. Maintaining all the features of standard spark plugs, multi-ground plugs extend plug life with more ground electrodes. Each NGK spark plug features high alumina ceramics for better heat transfer and electrical insulation. The patented triple gasket sealing process eliminates the possibility of combustion gas leakage
To ensure optimum performance please consult your owner's manual to determine the correct spark plug for your engine.
NGK Marine Surface Gap Spark Plugs. With a triple-gasket sealing process that keeps them secure at 50 G's, these plugs can withstand the roughest ride. There is also a solid copper core for greater spark and heat transfer, longer insulating nose to prevent fouling even when idling and a double-dipped zinc-chromate shell to resist corrosion and rusting. Standard equipment on all Mercury, Mariner, Force, Nissan and Mercruiser engines. Starting at: