Im no drag racer by any means! But i been around the race seine my whole life! One thing that will never change about any competitive sport is, people will lie! If your not willing to rip apart ever motor for tech,it will be extremely hard to determine the actual cc of the motor.. Thats why i suggested just 4 classes to try and keep it simple! Im sure people will still even try to claim their are running a different crank thats actually in their bike! Like i said before.. Unless your willing to do a true tech of every motor, your just taking someones word!