Power Stroke Products Heavy Duty Valve Springs for 7.3, 6.0/6.4, or 6.7
7.3L - Heavy duty valve springs for a 7.3 L Power Stroke engine, if you are running over 30 lbs of boost these should be ran to avoid valve float which is very harmful to your engine.
6.0L/6.4L - This is 32 springs. Heavy duty springs to prevent valve float over 35lbs of boost.
6.7L - These are a heavy duty Ovate wire spring, that is meant to prevent valve float above 35lbs of boost. These will with stand higher boost pressures well above 80lbs of boost.