Sierra International 18-5289 High Performance Ignitor II Electronic Ignition Conversion Kit for Most Prestolite V-8 Distributors Senses Current Levels in the Coil and Adjusts the Dwell to Maintain Peak Energy Throughout the entire RPM Range Fits: Most Prestolite V-8 Distributors with Screw Down Cap. Use with Sierra's Flame Thrower II Coil 18-5472 for Optimum Performance Develops, on average, 4 times more available Energy between 3000 and 5000 RPM's and twice as much Plug Voltage as Point-Type Systems Ignition Energy is Sustained and Coil Life is Increased when Peak Current Level is Reached just prior to Spark More Stable Timing All Sierra parts qualify for and are covered under Sierra's Industry Leading Customer Satisfaction Warranty Before Ordering, Please Verify this is the Correct Part for your Application. For Assistance, Please Call Sierra's Tech Support at 1-877-663-8396