From the Manufacturer If you are looking to upgrade your stock coil, or want to compliment the performance of your MSD Ignition, This line is the right choice. Special windings are used to provide maximum build-up of voltage...45,000 volts, 15,000 more than stock! These windings are held secure and kept cool in an oil filled metal canister. The tower assembly is molded of durable alkyd material due to its high dielectric characteristics. SPECIFICATIONS Blaster 2 Kit - Red, For Points, Electronic Or Msd Ignitions Primary Resistance: .7 Ohms Secondary Resistance: 4.7K Ohms Max Voltage: 45,000 Volts Inductance: 8 Mh Turns Ratio: 100:1 Peak Current: 140 Ma Spark Duration: 350 Us WARRANTIES One Year Limited Warranty Product Description If you are looking to upgrade your stock coil or want to complement the performance of your MSD 6-Series Ignitions, our blaster coils are the right choice. For MSD Ignition applications. With a stock points style ignition, a ballast resistor must be placed in-line with the positive terminal of the coil. These blaster coils are supplied with a 0.8 ohm ballast resistor plus a terminal and boot to fit most applications. Mallory Melonite applications also require the ballast resistor. Performance upgrade for canister style coils High voltage and energy output A performance upgrade for points Comes with 0.8 ohm resistor; fits most applications Use with stock or MSD 6-Series Ignitions