The Ford 6.2 spark plug requires a torque of 25-30 ft/lbs to properly seat the spark plug in the engine. It is important to make sure that each spark plug is tightened with an even force, as any extra force applied could damage the threads and lead to poor performance or misfires. When changing out your spark plugs on this model of Ford, it is recommended that you use a torque wrench for more accurate results. Additionally, if your vehicle has been running for a long period of time without new spark plugs installed, be sure to inspect all parts around the cylinder head before installation as well as lubricating each thread with anti-seize compound before installing them.