Actually, you don't want the bar to be so tight to the bushing that it restricts the rotation the bar. You want the bar to freely rotate as the suspension compresses and rebounds (think roller pearches). However you don't want any deflection when you load up one side during cornering. If you use rubber bushings you probably won't have any issues, but if using urethane bushings, get the greasable ones and try to keep the bar snug, but not tight.