Enhance the performance of your car with these high-quality spark plugs from Autolite. The set includes 8 spark plugs with a thread diameter of 14mm and a length of 3 inches. They are designed to fit Thunderbird, Cougar, V8, Escort, EXP, L4, and more. Made of copper, these spark plugs ensure a smooth and reliable ignition system. They are compatible with gasoline fuel and have a voltage of 12V. The manufacturer part number is 2544, and the OE/OEM part number is 5614062. These spark plugs are perfect for those who want to maintain their car's ignition system without worrying about quality.