When you're trying to generate horsepower, making sure you've got enough fire can be an uphill climb and the climb becomes more difficult as the RPM range reaches peak power. Having a robust ignition is key. PerTronix HEI Performance Ignition Modules are direct replacements for popular GM and Ford electronic distributors. These modules provide enhanced high RPM performance and when used with their corresponding Flame-Thrower coil, substantially increase spark plug voltage. Choose from 5 different modules depending upon your OEM distributor type.