Valving controls how the strut responds to inputs. Re-valving is having it disassembled and changed.strut is a dampener.It dampens the movement of the suspension to return it to a neutral state.it should do this as quickly as possible, while still allowing proper travel in the suspension. so you can re valve them to match the spring rate and the vehicle itself. So you'd have to find out the weight of the vehicle with you in it and fuel, then weigh it, pick springs, find rebound and compression rates and have the struts valved for that.OR you can just have it set to the billstein passenger car HD setting and run some vogtlands.