This set of 8 Autolite 665 Spark Plugs is a great choice for Buick, Cadillac, and Chevrolet owners looking for reliable ignition performance. These vintage parts have a copper construction and a standard configuration, with a 12V voltage rating and compatibility with gasoline fuel types. In addition, these spark plugs have multiple interchange part numbers and are OE/OEM replacements for 4339416, 5613935, 25164640, and 5613325. They measure 14mm in length and are designed to resist fouling and corrosion. Upgrade your ignition system with these Autolite spark plugs. Please review our business policies in our store for information regarding returns, shipping and warranties.