[Michael C Henry]

I ran into the ° difference between teeth and plug wire position .When installing Mallory Unilite distributor with mechanical tach drive . It had a very small swing to get timing correct. One direction Tach drive was into manifold the other tach drive was covering up the hold down bolt. My distributor has 20° of internal centrifigal advance and initial is currently at 12°BFTDC. My Mallory HyFire VI ignition box is start retard programable .I programed 8°. So it starts at 4° BFTDC and above 500 RPM it goes to 12° BFTDC. So it currently goes to 32° BFTDC at 2500 RPM.