Autolite Spark Plugs Spark Plug AR4152 Racing Spark Plug; Without Resistor; Copper Electrode Core; Nickel Electrode Tip; Flat Seat; 12 Millimeter Thread; 3/4 Inch Reach; 0.025 Inch Gap; 5/8 Inch Hex; Single

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NGK R7437-8 Racing Spark Plug | High Performance Iridium Electrode | Heat Range 8 | Resistor | Easy Install

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Upgrade Your Engine with Autolite Iridium XP Spark Plug | Better Performance, Durability, and Efficiency

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