NGK (5238) R5671A-9 Racing Spark Plug， Pack of 1<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Fine-wire center and ground electrodes provide better sparking and enhanced ignitability</li><li>Made to withstand the severe conditions that occur in racing engines</li><li>Zinc dipped shell prevents corrosion while the triple gasket seal eliminates combustion gas leakage</li><li>Special configurations are used for the insulator noses to improve throttle response and prevent fouling with corrugated ribs on insulator to prevent flashover</li><li>Many use precious metals such as platinum or gold/palladium for greater durability and lower voltage requirements</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31sv0BZ-uUL.jpg" noproxy>