The unique U-Groove ground electrode is one of the finest features of DENSO spark plugs. The electrode was developed to meet the demand for improved ignitability, necessary for increased efficiency in emission gas purification and fuel consumption. Product Features:Patented U-groove ground electrode design fires leaner mixtures than conventional plugsPrecision machine-rolled threads reduce seizing and cross-threading in delicate aluminum headsWide range of part numbers for thousands of applications, including classic and collector carsLasts twice as long as most conventional plugs100% pre-fired to assure reliable operationU-Groove Conventional
