Mallory YLM series magnetic breakerless marine distributor for 351W Ford engines. Replaces Mallory part # YLM554CV. Magnetic breakerless distributors are a self contained electronic ignition system that use a magnetic module with a trigger wheel for accurate and reliable ignition. This distributor is equipped with a cap and rotor. A simple 3 wire connection works with most 12V coils. USCG approved for marine use.