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Review on Autolite 303 4PK Copper Resistor Spark by Philip Breeze

Revainrating 2 out of 5

Correct spark plug for old engines. Used Champion

I liked not having to clean every four hours. Used on a 1954 Allis Chalmers WD45. I think it's a hotter fork. I have no more problems.

Pros
  • Resistor Reduces Radio Frequency Interference (RFI) and Electrode Erosion
Cons
  • Some Difficulties