The chassis plate on most 1:10 Team Associated race vehicles (RC10B6.3, RC10T6.2, RC10SC6.2) is manufactured with a 27.5 degrees kickup angle at the nose. These bulkheads allow for adjustment between 25 degrees and 30 degrees of kickup depending on the direction it is installed. Install the -2.5Deg or 25Deg side of the bulkhead towards the front of the car for 25 degrees of kickup. Install the +2.5Deg or 30Deg side of the bulkhead towards the front of the car for 30 degrees of kickup.