Upgrade your Ford's performance with these 8 Champion RF14Y Copper Resistor Spark Plugs. With a thread diameter of 18mm and a hex size of 21mm, these spark plugs are made of high-quality copper material and have a vintage design. They are compatible with gasoline fuel type and have a voltage of 12V. These spark plugs are a perfect fit for your Ford and interchangeable with part numbers 46 and BRF82. They are made by Champion Spark Plug, a trusted brand in the industry. Invest in these spark plugs for a smoother ignition and better fuel efficiency.