Because the angle of the A-arm axis means the rear bushings need to be angled, not just raised, as do the fronts. Unless you just let the rubber bushings take care of the angularity somehow. That would bind a lot though.
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911S
1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
http://www.flickr.com/photos/max_911_fahrer/
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