Performance Distributors Ford D. U. I. (Davis Unified Ignition) is the original one-piece ignition system for Fords! This is a simple, drop in unit. The coil is inside the cap and the module is inside the distributor. Just run one 12 volt hot wire to the distributor and you're ready to run! There is also an optional tach hook-up. The D. U. I. eliminates ALL of the messy wiring found on stock Ford electronic ignition systems. This really cleans up the engine compartment. The Street/Strip Ford D. U. I. is built with a 50, 000 volt coil that allows a whopping . 055" plug gap to be run and this will provide a more powerful burn of the fuel mixture. The Dyna Module is designed with more electronic dwell time producing a hotter spark. No ballast resistor is used. Stock Ford systems, and many aftermarket systems require a ballast resistor which reduces the voltage in the ignition system. The D. U. I. allows FULL voltage into the ignitionsystem, providing a better spark and more power. Every D. U. I. is curved on a Distributor machine based on the specs of your Ford motor. a super smooth curve will eliminate engine damaging detonation provide instant throttle response. The Ford D. U. I. is a real work of craftsmanship. Although it is uniquely designed, replacement parts are easy to obtain. High Energy Ignition (H. E. I. ) replacement parts will fit right on the D. U. I. The unit is polished and lubed as it is assembled. Built for durability, the D. U. I. has an upper and a lower bushing, unlike stock Ford distributors with only one bushing.Pit Stop USA offers D.U.I. Street, Strip Distributor: SB Ford 302 w/ Factory Roller Cam w/ Vacuum Advance DUI38820 at low everyday prices. Be sure to check out all of our products from Performance Distributors D.U.I. including Performance Distributors D.U.I. Distributors.