I have to disagree Denny. If the two gears are one tooth off, yes, the cam timing is changed, either retarded or advanced in relation to the crank. But when that happens, the gear on the cam that drives the distributor is also off, either retarded or advanced in relation to the crank. So the motor will not time with a light at the same place on the damper with it one tooth off and then corrected if the distributor housing remains in the same position throughout the operation.