Below is part of a "canned response" we email S197 people a lot...
===
We are often asked:
"What camber setting should I run with Vorshlag camber-caster plates?"
The answer is... it depends on what you are doing with the car (street, track, autocross, etc) and what tire width and compound you are running. Spring rates and associated dampers also come into play, as does ride height.
On the car above we were running adjustable monotube coilovers with 450F/175R spring rates, a 275mm Bridgestone street tire on an 18x10" wheel, and ran -3.0° front camber. Between Camber and Caster, the
front Camber setting is
much more important. Depending on tire size and tracks being run, we recommend -3.5° to -4.5° up front for race cars. For stock-sized street tires -2.5° is more appropriate on track.
Camber can be changed quickly track side, but caster takes a bit more time. As you increase negative camber on the S197, the front toe will go "out". Typically a 2 degree change adds about 1/8" toe out.
If you will be leaving the alignment specs leave alone for dual purpose street/track use, shoot for -2.5° front camber and a ZERO front toe setting. Toe out wears tires more quickly than camber does and we have put countless miles on McPherson strut cars with -2.5° front camber without ill effects.
With more grip usually there is a need for more camber. Once we moved to 315mm race tires (shown above) then up to 335mm Hoosier rubber up front we ran close to -4.5° static front camber, for autocross or track use.
We recommended around +6.5° caster - which should be what our camber-caster plates get in the stock (centered) caster location, which is more than enough. There are two more settings which each add about 1/2 degree of additional caster. Running the "centered" of the 3 caster settings (which is how we assemble this model when first built) gives you more camber adjustment at the top of the round factory strut tower opening. Caster is like anything else - too much can be a bad thing. +8 degrees is in that "too much" category. We ran the 6.5° caster setting on our TT3 Mustang and it worked very well, setting lots of track records with dozens of wins.
We designed the Vorshlag camber-caster plates to have additional positive caster and negative camber range *beyond* what the round strut tower opening allows, for folks willing to cut the strut towers to add more camber. This is pretty extreme and usually reserved for race cars only - and then only when the class rules allow modifications to the strut tower. The image above is a 2013 Mustang race car with the strut towers cut open - which allowed for more camber and caster travel. We typically do not recommend any of that unless it is a "fangs out" race car. Please contact us if you want more instructions of why and how to do this - we even have a tool we built that we can rent out to help cut this opening cleanly.
===========
hope this helps...