NGK SPARK PLUG HIGH TUNE ROAD / RALLY

A higher compression engine should have a colder spark plug. The engineers explain that it has to do with flame temperature and overheating the plug. I know from experience that my race engine will melt a street plug. Choose from the following NGK plugs: Cold Street = BP7ES Colder Street = BP8ES Cold Race = BP9EV Coldest Race = BP10EV For recessed nose plug see B8ES.