Champion Atlas Copper Plus part number RV15YC for many popular 1967 – 1981 North American 8-cylinder car and truck engines. Box of 8 new in individually sealed packages for $25. These have been in storage for 20 years. A list of compatible 8-cylinder engines is available (eg. Avanti, Bricklin, Buick, GM, Ranchero, Fairlane, Lincoln, Mercury, Dodge, Chevrolet, Ford, Dodge).