Chevrolet Racing DUI Distributors – V8 / 6 Cylinder / 4 Cylinder


**Current Estimated Shipping Time For This Distributor is 6-8 Weeks**


  • No Multi-Spark Box Needed
  • Eliminates Top End Misfires
  • Low Amperage Draw
  • Rated Up To 10,000 RPM's
  • Twice The Firepower Of A Magneto

Click Here to Download GM Racing DUI Distributors Instruction Sheets

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Our Racing D.U.I. Distributor is a high performance, precision built ignition system that is capable of turning up to 10,000 RPM’s. That’s almost double the output of a stock H.E.I.! Modern technology and years of HEI engineering experience has allowed us to develop a high voltage coil, high dwell module and mechanical advance system 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.

The Racing D.U.I. Coil allows spark plug gaps to be opened up to .055″ and the increased dwell in the Dyna-Module creates longer spark duration. These two components produce a spark so intense that it is unmatched by stock HEI’s and other “performance” ignition systems, particularly those using the external spark boxes. The end result is a more complete burn of the fuel mixture for more horsepower! 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. due to more fuel being burned on each piston stroke. The wider gap also helps spark plugs stay cleaner longer which means fewer plug changes at the track.

The centrifugal advance system is precision tuned on a Sun Distributor Machine to provide your engine with easy starting, better throttle response and more power through the RPM range. 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 that is virtually maintenance free. You’ll be able to run more timing (without detonation) than ever before and there is no excess advance at high RPM’s.

Additional advantages include our “no-resistance” rotor bushing, to ensure all of the spark energy from the coil is distributed by the rotor, nylon screws in the rotor to prevent misfires in the high RPM’s, a racing coil designed to run cooler than oil filled coils and widely spaced cap terminals to prevent crossfire, a common problem with smaller diameter caps. Amperage draw off the battery is minimal as the Racing D.U.I. only pulls 2-3 amps, whereas other aftermarket ignition systems can draw 10 amps or more. For those not using an alternator, this prevents major voltage drop in the battery.

This is the only magnetically triggered, self-contained (internal coil and module) distributor available that will spin 10,000 RPM’s! It surpasses all other HEI style distributors in quality and performance. Don’t underpower your Ignition with a low cost inferior HEI, insist on a quality built D.U.I. (Davis Unified Ignition) for your race engine and Drive Under the Influence of more power!

**Each DUI Distributor is hand built to order with quality components and attention to detail. Due to our meticulous process, distributors are not available for immediate shipping and take time to produce. With added supply disruptions in raw materials, our current processing time averages 6-8 weeks from the time an order is received until it ships.**

Chevrolet Racing DUI Upgrade Options

Have a roller cam? Visit our Distributor Gears page to select the correct gear for your camshaft.

ITK-127212 – Instant Timing Knob: This feature allows you to make fine tuning adjustments without using a timing light. Once the total timing is dialed into the engine, fine tuning can be accomplished with a simple turn of the knob. The knob is marked and can be locked into position so that you do not lose your adjustment due to vibration. Allows for 6° of adjustment.

L-127212 – Locked Advance: Racing DUI with no mechanical advance. Locked solid for total timing from idle to your max rpm.

D-127212 – Deluxe Version: Racing DUI with adjustable slip collar for distributor adjustment in engines with shaved heads and decked blocks. Also features the Instant Timing Knob for fine tuning adjustments.

SPM-127212 – Supreme Version: Same as the Deluxe Version with the Ultra-Poly Composite gear added for use with ANY camshaft.

S127212 – Stealth Version: Distributor comes completely stock appearing but has the racing goodies inside. No decals, no polished housing, has black cap with stock coil cover.

The Racing DUI Distributor has a 30 Day Warranty from date of purchase.

LiveWires For GM DUI

Delivering a high voltage spark to the plug requires a quality spark plug wire. Our LiveWires are unsurpassed in quality by offering low resistance and high temperature protection. The 8mm wire is covered by a heat treated fiberglass sleeve that protects the wire up to 1400° F. The spiral wound core is radio suppression so there is no radio noise or computer interference. Unlike universal plug wire sets, LiveWires do not require any assembly. All sets are custom fit and numbered at each end for the correct cylinder. Colors available are black, blue, green, orange, purple, red, silver and yellow. Please visit our LiveWires page for more information.

Additional information

Weight 7 lbs
Chevrolet Racing DUI

4 Cylinder – 2.5 Liter (Long Distributor Shaft) No Vacuum, 4 Cylinder – 2.5 Liter (Short Distributor Shaft) No Vacuum, All Small/Big Block V8 (Deluxe Version), All Small/Big Block V8 (Mechanical Advance Only), All Small/Big Block V8 (Stealth – Stock Appearing Version) w/ Vac Adv, All Small/Big Block V8 (Stealth – Stock Appearing Version) w/o Vac Adv, All Small/Big Block V8 (Supreme Version), All Small/Big Block V8 (w/ Instant Timing Knob), All Small/Big Block V8 (w/ Locked Advance), All Small/Big Block V8 (w/ Mechanical Tach Drive), All Small/Big Block V8 (w/ Vacuum Advance), Inline 6 Cylinder – 250-292 CID (No Vacuum), Inline 6 Cylinder – 250-292 CID (w/ Vacuum Advance), V6 – 173 CID (2.8 Liter) No Vacuum, V6 – 262 CID (4.3 Liter) No Vacuum

Color Choice

Black, Blue, Clear, Red, Yellow

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