Originally Posted by
jha07
Why? I can see this being important if we didn't have droop screw.
I used calipers when I built mine as well, but I really don't see the need for it.
It is important so that at ride height, your pistons sit at the same position in all 4 corners. The piston height has a bit of an effect on how the oil flows through. Having all shocks the same length ensures all 4 shocks are "equal" which should make the car more consistent.
This also allows you to set your shock collars at the same height L/R and can help you identify when your car might have some tweak.