NGK Racing .5 Spark Plug (R6725-105)

This is a box of four NGK R6725-105 racing spark plugs. These plugs are built to handle the toughest racing environments, offering durability and reliable ignition when you need it most. They are designed to withstand extreme engine conditions, making them a popular choice for competition vehicles.

The center electrode on these NGK racing plugs features special designs to ensure they hold up under pressure and ignite fuel consistently. The copper core helps pull heat away from the combustion chamber, and the corrugated ribs on the insulator prevent electrical flashover. Plus, the trivalent metal plating on the plug body helps prevent corrosion and seizing, making installation and removal much easier, even after hard use.

These plugs are intended for racing applications only. Always refer to your vehicle's service manual or consult with a professional to confirm the correct spark plug heat range and gap for your specific engine build.