I believe that "all" C30E-B flywheels are 160 tooth from the factory. That doesn't mean that some haven't been changed over the years. The C30E-B date coded 6A13 that I just recieved shipment of counted 160 (worn out teeth) and it apears that it has been rebalanced to 28.2 oz. or even lighter 26 oz. it has orange paint daub and the hardness test. It has been rebalanced to run without the hatchet. I hope I can reverse this. Does a machinest or engine builder plug weld in the drill holes to return the balance or drill more holes?