Taken from here: http://www.duratecnc.co.uk/?p=52
I put lowering springs on and the car hasn’t gone fully down.
The suspension arm bushes on the front upper arm have not been slackened off to reset them to the new ride height and are twisted, holding the car up. To some (lesser) degree this does happen at the rear too, especially when the bushes are seized onto the through bolts and have been twisted to set the geometry or the car lowered. The cure is simple at the front; slacken off the offending upper bolts and with the car sat on its wheels, the bushes will rotate, car drop down then tighten them up. To explain a bit more of what is happening: The inner bushes front and rear are of the torsion type, so are locked in place by the through bolts, when the arm moves up naturally and down it twists the bush which contributes to roll stiffness.