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Mallory Promaster Classic ignition coils are for street-driven vehicles with breaker point ignitions or OE electronic ignitions. Delivers optimum performance when used with these Mallory ignition products: UNILITE Distributor with a HYFIRE Capacitive Discharge Ignition, Magnetic Breakerless Distributor with a HYFIRE Capacitive Discharge Ignition, or Dual Point Distributor. Effective to approximately 6,500 RPM when used with a point type distributor (depending on engine combination). Effective to approximately 8,000 RPM when used with a Mallory HYFIRE Electronic Ignition Control (depending on engine combination).