Learn more about the Modify-Tech AOE Cylinder Head & Piston Set that is about to be released... "Many player respect AOE (Angle of Engagement) as important of gearbox. Some of players will use sorbo pad or washer on piston head/ cylinder head and remove the piston teeth by hand to get right AOE normally. But we think it is a palliative way to correct it. We designed an AOE Cylinder Head and Piston and tested it over again and again.