The Racing D. U. I. Distributor is capable of turning 9000 RPM's. That's almost double the output of a stock H. E. I. ! Years of engineering experience and modern technology allowed us to develop a high voltage coil and high dwell module that would turn the high rev's needed for today's racing engines. No external spark boxes or coils are needed as our race coil and module fit inside the distributor for an easy drop-in installation with a one wire hookup. This is the only magnetically triggered, self-contained (internal coil and module) distributor available that will spin 9000 RPM's!The Racing D. U. I. Coil allows spark plug gaps to be opened up to . 055" and the increased dwell in the Dyna-Module makes the coil produce a longer duration spark. The combination of these two components produces an intense spark that is unmatched by stock HEI's and other "performance" ignition systems, particularly those using the external spark boxes. The result is a more complete burn of the fuel mixture for more horsepower. Amperage draw off the battery is minimal as the Racing D. U. I. only pulls 2-3 amps, whereas other aftermarket ignition systems draw 10 amps or more. For those not running an alternator, this prevents the battery voltage from dropping too quickly. The Racing D. U. I. also sends 2-3 times more spark into the combustion chamber than a magneto. The plug gap with a mag is a mere 015" - . 025", so horsepower is gained with the D. U. I. because more fuel is burned on each piston stroke. The wider gap also helps spark plugs stay cleaner longer which means fewer plug changes at the track. The Racing D. U. I. makes point systems obsolete. You won't waste time and money changing points for every race and you'll get more voltage into your system than points can handle. The advance system is tuned to give you better throttle response and more power. All of the moving parts are hand fitted to assure the smoothest advance curve possible. The weights are fabricated from very high quality hardened steel which are virtually maintenance free. You'll be able to run more timing (without detonation) than ever before. There is no excess advance at high RPM's as with other H. E. I. 's due to a unique mechanical advance system devoloped exclusively by Performance Distributors. The Racing D. U. I. Coil is designed to run cooler than all other coils, including oil-filled coils. Our "no-resistance" rotor bushing carries all of the firepower from the coil to the rotor. The units wider distributor cap terminal spacing elimnates cross fire which occurs in smaller diameter caps. Nylon rotor hold-down screws help prevent misfire at high RPM's. Available with or without vacuum advance, the unit includes a brass terminal cap.Pit Stop USA offers D.U.I. Racing Distributor - Chevy V8 DUI127212 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.