These Colder Spark Plugs are designed for the Ford Modular three-valve engines (4.6L and 5.4L), including those found in the 2005-2006 Ford Mustang GT and the 2004-2006 Ford F-150 with the 5.4L, 3V engine. This is the same spark plug that is installed in the Stage 3 ROUSHcharged Mustang and F-150 packages.
The need for installing a colder spark plug is to prevent pre-ignition and detonation of the fuel due to the higher cylinder temperatures found in the supercharged engines. Pre-ignition is typically caused by many factors, such as an overheated spark plug tip which acts like a glow plug to ignite the charge. This puts a tremendous load on the engine and adds considerable heat, a recipe for serious damage.
These ROUSH Performance Colder Plugs are one heat range colder than the stock Mustang plug and are designed specifically to handle the high boost pressure and air flow into the engine. Price is for 1 plug. The gap on these plugs is 0.045 inches.
- Estimated Shipping Time: 3-4 Days
