Most street car alignments call for the front camber and caster settings to be adjusted to slightly different specifications on the right side of the vehicle compared to the left side. These slight side-to-side differences are called cross-camber and cross-caster.
The vehicle manufacturers' alignment specifications usually identify a "preferred" angle for camber, caster and toe (with preferred thrust angle always being zero). The manufacturers also provide the acceptable "minimum" and "maximum" angles for each specification. The minimum and maximum camber and caster specifications typically result in a range that remains within plus or minus 1-degree of the preferred angle.
For street cars and the type of NCCC racing we do, camber and caster settings should be identical or as close to identical as possible for left and right side values. The measurement terms used to describe this are known as cross camber and cross caster. There are certain parameters for these values to fall within. For example, on C4’s the front cross camber is +/- 0.5 degrees. If you desire your front negative camber to be 1.5 degrees and that is your driver side value, then the passenger side value should be between -1.0 and -2.0 degrees. If your technician takes a little extra time, he should be able to get the two sides within a tenth of a degree of each other. On occasion, I have been able to set the values to be identical to each other. For C4 or earlier generation cars that utilize shims for adjustment, this does take some patience and extra time.
Designed to work with the OEM style springs as well as 2.25″, 2.5″ and 60mm inner diameter race springs, these caster/camber plates are machined from 6061-T3 billet aluminum and offer a unique design that allows camber and caster adjustments without removing anything from your Mustang.