Billy Sport + H&R Race + GC Spec E30 Plates = ??? Alignment Specs

[Jean]

Turn the bearing plates around 180*, they are offset to one side from center.

Correct.

[Wh33lhop]

You have chassis/strut issues then.

My car with M3 cabs and the GC plates set at around 1.25° were at -2.5° camber on the machine.

M3 or offset CABS, will give you additional camber.

Sorry to bump a thread (and sorry to contradict you Z31 ;)), but I think this is a common misconception--offset CABs, when installed correctly, actually reduce the front track width, and thus reduce camber (or rather add positive camber)--their main purpose is to increase caster.

The idea of the offset CABs is that by moving the rearward pivot point of the LCA outward and keeping the subframe (middle) pivot point stationary, you sweep the spindle ball joint towards the front of the car and towards the centerline of the car (forwards and inwards). The effects are twofold: increased caster and decreased camber. Personally I am a huge fan of caster and don't see why anyone wouldn't do this, as the extra caster far outweighs the small negative camber loss.