Edelbrock part No. 22743 HEI Coil-In-Cap, design is for use with GM HEI coil in-cap distributors with red and yellow primary wires. This coil is perfect for use with high performance engines requiring maximum voltage. Designed to work with aftermarket performance 4-pin modules and high performance electronic controls. Features optimized resistance levels to match the high amperage dwell circuits of performance ignition modules. The result, is a faster charge and full coil saturation at higher RPM levels. Also features a high temperature epoxy that resists shock and vibration while providing excellent thermal conductivity while ensuring long service life. Includes an installation hardware kit.