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For vehicules from 1969 to 1977, the model 911 Perma-Tune is designed to replace the stock ignition box and will bolt up and plug in to the same location as the stock system. The advantage of the Perma-Tune system is to produce a hotter and longer-lasting spark. This improves combustion, reduces emissions and improves engine horsepower. By design, Perma-Tuneignition boxes makes make very little heat of their own.
The model 911 increases spark energy by a factor of three times that of the stock ignition system. This is why spark plugs will never foul again, and will actually recover from fuel contamination. The Perma-Tune system uses the points only as a sensor so they will generally last the last life of the engine. Dwell is not a factor; simply set the points to stock gap specifications and then adjust the engine timing using a timing light.
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