Ignition Basics
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The original inductive-discharge ignition system used points to both charge the coil and then trigger the spark. Unfortunately, with only 8 or 9 volts on the primary side, spark energy is limited. The GM HEI improved spark energy, and now aftermarket units like ACCEL, Performance Distributors, Pertronix, and Crane’s XR700 inductive unit offer ignitions that can support over 400 hp and 7,000-rpm engine speeds. View Related Article
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