The spark that triggers combustion needs to pass through different points before it reaches the engine--from the battery to the coil, the distributor, wires, and finally, the spark plugs. To ensure that your engine gets just the right amount of spark, each of these points must be kept in proper condition. Between the first and last point of the spark's travel, it passes through the distributor, the part that distributes spark to the proper cylinder via the distributor cap and rotor. The distribution takes place via the cap, so this component must be of high quality to ensure efficient spark travel. Have you ever considered getting a Mallory distributor cap? It is perfect because it has high dielectric strength and great resistance to impacts. The Mallory distributor cap also features a screw-mounted spark plug wire retainer, screw down cap attachment style, and brass contact terminals that ensure better retention of spark plug wires.