Sale 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 Autolite Spark Plugs $308.64 Add to Cart