[Purdy Swoft]

I didn't say that where the rotor tip points controls when the points open !!! I said that where the rotor tip points is where the spark goes . Adjustment of the distributor cam controls where the rotor tip points . The spark happens when the points open . Of course the lobes of the distributor cam controls when the points open . Where the rotor tip points is the most important thing about ignition timing . When the points begin to open is when the spark occurs . These two things control how accurate the initial , ignition timing will end up . If the rotor tip isn't pretty close to the proper position the engine won't run . It is often a waste of time trying to explain a procedure to a person that is more interested in argument than anything else . .