MCS-508731 - Dual fire ignition module for mechanical advance. This module is optically triggered by an infrared light and a photocoupler. Therefore this system will provide a 100% stable ignition timing; at any RPM. The Mallory''s E-Spark can be used to drive any ign

Fitment:
70-99 B.T. (excl. Twin Cam; excl. fuel injection); 71-03 XL (NU)