If you are looking to upgrade your stock coil or want to compliment the performance of your MSD Ignition, the Blaster Coils are the right choice. With a stock points style ignition, a ballast resistor must be placed in-line with the positive terminal of the coil. The ballast is not necessary if an MSD 6 or 7 series Ignition Control is being used with the points distributor. When you are using an MSD Ignition Control, the ignition is responsible for delivering the voltage to the coil so a ballast is not necessary.
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