HVC coils are designed for racing applications using an MSD 7, 8, or 10 series ignition. Due to their unique design, the Pro Power HVC coils are perfect for long duration racing events or on the street. A spark plug-style terminal is used to grip the secondary wire, and a Weathertight connector is supplied for a positive connection. HVC coils are designed for racing applications using an MSD 7, 8, or 10 series ignition. Due to their unique design, the Pro Power HVC coils are perfect for long duration racing events or on the street. A spark plug-style terminal is used to grip the secondary wire, and a Weathertight connector is supplied for a positive connection.