Originally Posted by EEChris
Do anybody know how many additional head shims are needed for the 12+3ct?
You do not need any more head shims to run 16-20%. If you want to run 30% you should add at least one .1mm head shim. You may want to add a total of .2mm depending on the weather, and powerband wanted. This is a total of .4-.5mm of total head shims. This should get you close.