Ignition Timing

Connect timing light and tachometer. Disconnect and plug vacuum advance and retard unit hoses. Start engine, set idle speed to 900 RPM. Rotate distributor as necessary to align timing marks. Timing mark is a steel ball embedded in flywheel and a pointer in a window located in right side of flywheel housing. Tighten clamp bolt and recheck timing. Reconnect vacuum hoses and adjust idle speed and mixture.