Hi Ross,
The manual instructs you to build the car using the 20 degree kick shim with the included 10 degree caster blocks giving an overall caster value of 30 degrees. An additional 5 degree shim is also included in the kit that allows you to change the kick angle to 25 degrees if required.
Using the 25 degree shim with the standard 10 degree caster blocks will create an overall caster value of 35 degrees which will make the car a little less twitchy but may cause a little understeer.
It is most common to reduce the amount of caster when using a larger kick shim as more kick promotes weight transfer rearwards resulting in slightly more rear grip, a smaller caster block such as a 5 degree block is often used to compensate.
Chris
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