Blaster HVC, Works w/ MSD 6 Series UnitsDesigned for high rpm, long duration applications. Works with electronic ignitions and MSD Ign Controls (ballast resistor required for points systems). 100:1 turns ratio and lower primary resistance produce high voltage output. Windings are encased in blue epoxy and secured with extruded brackets. Spark plug style terminal and threaded brass primary studs. Supplied with rubber shock mounts. CARB E.O. Approved.