Designed to work with both breakerless electronic ignition systems or ACCEL, Mallory, Crane, Holley or MSD capacitive discharge ignition systems, the E-core design minimizes inductance losses and maximizes energy output. Special high temperature epoxy resists shock and vibration and provides excellent thermal conductivity while the extruded aluminum heat sink provides maximum cooling to ensure long life. SAE male tower offers greater coil wire retention and protection from arcing. Comes complete with insulated primary wire connector and universal ACCEL 8.8mm Spiral coil lead and mounting hardware kit.