Davis Unified Ignition (D.U.I.) Ford Duraspark Electronic Distributors are a high performance unit for those who want a completely stock appearing or factory style electronic distributor. Each Duraspark Electronic Distributor is custom calibrated on a distributor machine and blueprinted to provide maximum power, torque and instant throttle response. A super smooth advance curve assures excellent performance and mileage, a vacuum advance is calibrated for maximum fuel economy and light throttle ping is eliminated. The factory center bushing on the Duraspark distributor is replaced with a full length bronze oil impregnated bushing to provide increased durability and cure top end timing fluctuation. Included with a brass terminal cap and rotor.