ACCEL 8124ACC Heavy Duty Distributor Cap and Rotor Kit - Black Impenetrable barrier to arc through and crossfire Guards against high temperatures and surges of spark current that can melt molded components in Original Equipment caps Specially designed for 1956 to 1978 GM V8s Made from a high performance 60kV rated alkyd compound Brass inserts and stainless steel rotor springs allow unrestricted spark energy flow