The Z1 upper control arms are adjustable but only for camber. They have the recommended 6 degrees of caster already built in which makes for a stronger design. To adjust the caster you simple remove the upper ball joint and turn in or out and reattach. My alignment shop was familiar and used a floor jack on the ramp to slightly lift the car and reach from under to adjust. Wheels never came off. Had my alignment done at Texas Track Works in Ft. Worth.
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