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This diagram shows the dramatic differences between having a lot of positive or negative caster. Caster is the angle in which the steering pivot axis is tilted forward or rearward from 90-degrees vertical, as viewed from the side. Andy and everyone on the LS1gto site were keen on dialing in a lot of positive caster on our late-model GTO. Since Andy provided us with adjustable radius rod bushings, we were able to increase our positive caster to 9.5 degrees on both sides. Having this much caster not only increases straight-line stability, but also steering effort. This is something that should be kept in mind for older Pontiacs without power steering because it can make it difficult to steer. It's also important that both sides are equal-it will cause the car to track left or right if they are offset.