Our 1975-1984 Corvette HEI Distributor Cap & Coil boosts spark plug voltage by up to 40% for a hotter, more efficient spark. These Corvette HEI Distributor Cap units come complete with a new cap and coil that is a direct replacement for your OE parts. The Corvette distributor cap is made of a high dielectric material to prevent carbon tracking and is equipped with brass terminals for maximum conductivity. Choose from Black or Red color. Rotor sold separately.