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The Pertronix Ignition "Second Strike" box has served us well these past months. What it does is refire the spark plug at a selectable point after the initial firing. For example, the first firing is at 32 degrees BTDC and the "second strike" is 2 degrees later at 30 BTDC. That 2 degrees is called the Crank Angle Offset, or C.A.O.