No load, no resistance, for a hotter, sure fire, Max Spark. Fits 009 and late Double Vac Bosch distributors. Stock rotors have up to 5.45 K Ohms built in, which creates heat and frequent rotor failure, when used with a high performance ignition.
The Max Spark Rotor is designed for use with stock or high energy applications, and fits right in for improved spark and increased reliability.