I know this has been discused before, but i searched and didnt find a good straight answer. Supertech springs fit in the eco head with no mods, no problems, even with higher lifts correct? Can i use the stock valve with the springs? Whats the advantage of different valves over stock?


horsepower is the force that determines at what speed you hit the wall, torque is the force that determines how far you take the wall with you after you hit it.