Brisk Silver Racing Spark Plug - 14 mm Thread - 19 mm R - Heat Range 10 - Gasket Seat - Non-Resistor Rod Guide Extension Spread port heads have the

Spread port heads have the center exhaust ports spread apart 5/8'' over stock L98 GM heads

Adhesive included with glue-on mount

1983-2007 Ford F-150

You can use a large even if your neck is smaller to give more room over a collar bone

5 Ford Mustang

Brisk Silver Racing Spark Plug - 14 mm Thread - 19 mm R - Heat Range 10 - Gasket Seat - Non-Resistor Rod Guide Extension Spread port heads have theProduct Description: Spark Plug Silver Racing 14 mm Thread 19 mm Reach Heat Range 10 Gasket Seat Non Resistor Sold Individually Since its founding in 1935, Brisk has been a leading innovator and producer of spark plugs. Serving both the OEM and the aftermarket and racing industries, Brisk offers a wide range of spark plugs for a variety of applications, including iridium, platinum, and yttrium. Brisk's silver center electrode technology makes them the