HEI Distributor - Ford 351W A switchless HEI Distributor with electronic tachometer output generating 65,000 volts. Hei distributor is a strong distributor with a built-in ignition coil. It has an aluminum housing and double steel bushings. The distributor has a strong ignition amplifier and generates 65,000 Volts. It has solid brass contacts and a simple 1-wire connection. The gear is made of sintered metal. Fits engine: 351W Installation: BAT - connected to ignition voltage TACH - connected to tachometer if one is to be used. NOTE The electricity in cars with original ballast resistors must be rewired so that the new ignition coil receives ignition current directly from the battery.