Which instructions? The original Moog instructions? Probably not more than +2° caster.
The instructions for maximum caster should give up to about +3.5°
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If they wouldn't give you the specs, then I would absolutely suspect the alignment. You don't need a printer to give the specs. Most alignment shops now have no experience with aligning one of these cars. And their computers always show the factory specs anyway, which are for bias ply's and call for negative caster and positive camber. Which is a disaster for radials.
