Re: Herb Adams Sway Bar
None of the HA bars do that I recall. My Ranchos to (I thought I was one of the only ones who still had them! Glad to hear I am not alone Mike!!).
HA bars that I have seen are fixed, but the endlinks are adjustable to preload the bar left/right. If you have them off, you can preload the suspension for say circle track use, or drag racing, etc. But for the street, I would recommend keeping them identical in length, as you don't want the car to be preloaded, else it will handle differently left to right.
What car do you have the HA bar on?