41-121 ACDelco Iridium Spark Plug, 1-pk v419327-v419326-v381757-v314788-v314786-v314785-v314784-v381756-v448778-v448776-v391546-v315093-v494500-v494478-v388493-v388494-v416184-v416185-v389523-v389522-v389521-v389518-v310472-v302860-v302861

41-121 ACDelco Iridium Spark Plug, 1-pk v419327-v419326-v381757-v314788-v314786-v314785-v314784-v381756-v448778-v448776-v391546-v315093-v494500-v494478-v388493-v388494-v416184-v416185-v389523-v389522-v389521-v389518-v310472-v302860-v302861ACDelco Iridium Spark Plug offers better engine idle stability and smoother performance Allows for smaller, more efficient electrode designed for improved cold starting and quicker acceleration Fine wire electrode helps improve ignition of the fuel and burns away carbon deposits on the tip of the plug as they form, to help improve fuel economy Includes 1 spark plug per package

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