To change the roll center, you either have to raise or lower the front, or the rear, or both of the car. You can also move the center of gravity height by raising or lowering it, by moving weight up or down, which will raise or lower the roll center. Or you could channel or raise the body.
Factory cars have a center of gravity height from 18 to 25 inches above the ground.
The further that the roll axis(center line of car front to back, which passes through roll centers) is from the CGH the more roll you get.


Pat