Pertronix 71283 Ignitor for Ford 8 Cylinder Engine Delivers twice the voltage to the spark plugs, increasing horsepower, fuel economy, and spark plug life. 2:1 improvement overpoints in current fall time for increased coil output. Epoxy molding makes our module impervious to dirt, oil, grease and moisture Stable timing no need for any adjustments. Available for 6 and 12-volt negative and positive ground systems.