The pitted rotor tip is usually the result of using metallic-core ignition wires instead of resistance wires. The voltage from the coil jumps a small gap inside the distributor cap from the rotor to the individual plug wire terminals. Metal-core wires have virtually no resistance, so the spark acts like an arc welder. The rotor carries six times the number of spark impulses as the plug tower terminals, so it erodes more quickly.
Jerry
Very good to know. I'll check the plug wires in the next few days.
Thanks Jerry!
