[JWL]

I am afraid this is not yet understood. Changing distributor teeth has NOTHING to do with the relationship between the timing light and the pulley marker for where best performance is achieved. Where the light flashes on the pulley/pointer is the actual ignition timing. If the engine ran at it's best with the flashing light 1 1/2 inches beyond the pointer it will continue to do so no matter which distributor tooth is engaged. Changing tooth engagement does not impact the relationship between spark timing and best engine performance.


Of course connecting the light to the wrong plug wire will alter results.