Resistor: Yes
Electrode Tip Material: Iridium
Electrode Core Material: Iridium
Center Electrode Type: Projected
Spark Plug Thread Size: 14mm
Spark Plug Reach: 26mm
Spark Plug Seat Style: Tapered
Wrench Diameter: 5/8 in.
Ground Strap Quantity: One

Brisk iridium racing spark plugs increase your engine power. Iridium is 6x harder, 8x stronger, and has a 1,200 degrees higher melting point than platinum. These plugs are power-focused, putting the spark exactly in the focal point of the reflector. They require lower supplied ignition voltage, and are built with an optimized diameter center and cut back ground electrode. Iridium spark plugs are ideal for high-pressure, high-output race engines, as well as turbo, supercharged, or nitrous applications.

Additional product details:

* Less quenching, better air/fuel mixture access equals more power
* Ability to ignite lean mixtures and difficult-to-ignite fuels
* Good resistance to fouling and easier starts

Silver Racing spark plugs are ideal for these applications:

* Race engines and engines with hard-to-ignite fuels
* Supercharged, turbocharged, or nitrous engines
* Total loss ignition systems
* High mileage vehicles

Popular Applications:

Ford Mustang 5.0 Coyote

Chevy LT1/LT4/LSA

Dodge HEMI Engines 6.1/6.4L

Dodge SRT 4

Chrysler 300

Chevy Cobalt SS

Saturn ION Redline

Chrysler PT Cruiser

Ford Focus