Autolite 3924 Spark Plug Copper Core (Quantity 12)
- Electrode Tip Material: Resistor, Reach: 3/4 in, Resistor: Suppressor, Seat Type: Gasket..
- Thread Diameter: 14 mm, Tip Configuration: Power, Wrench Diameter: 5/8 in..
- Power tip extends further into the combustion chamber to aid in self-cleaning, reducing fouling at low rpms and pre-ignition at high speeds..
- Traditional nickel electrodes. Copper core improves resistance to fouling..