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 plugs
• Precision machine-rolled threads reduce seizing and cross-threading in delicate aluminum heads
• Wide range of part numbers for thousands of applications, including classic and collector cars
• Lasts twice as long as most conventional plugs
• 100% pre-fired to assure reliable operation
• U-Groove Conventional