the things that wear tires are camber and toe . caster just help with strieght ahead and streeing wheel return i like camber at 0 or 1/4 to 1/2 neg. with toe at 1/16 to 1/8 toed in. caster on power steering can set higher if posable. like moparkid said higher caster will make the car drive strieghter. on non power cars low caster helps with steering wheel return . there not a lot of adjustment with keeping camber close to 0 . hope that helps i have some old alignment spec. books if you want fac. spec,s just let me know als
