Edelbrock GM HEI Coil-In-CapEdelbrock part #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