Chevrolet Big Block 348-409 DUI


**Current Estimated Shipping Time For This Distributor is 4-6 Weeks**

The D.U.I. Advantage

  • Simple One Wire Hookup
  • Allows For Wider Plug Gaps
  • Instant Throttle Response
  • No Spark Box Needed
  • Custom Tuned For Your Engine
  • Hand Built to Exact Tolerances
  • 50,000 Volt Coil and Dyna Module
  • Over 30 Years of HEI Experience
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Now available is the DUI Distributor for the big block 348-409 cubic inch Chevrolet “W” engine. This new DUI (Davis Unified Ignition) is fully electronic with the high voltage coil in the cap and the high dwell module inside the distributor. Only one 12 volt hot wire is needed for hookup! Each unit has a custom timing curve dialed in using a Sun Distributor Machine to achieve proper timing requirements for these unique engines. The optimized curve provides instant throttle response and maximum performance throughout the rpm range while avoiding engine damaging detonation. Our high voltage coil produces 50,000 volts of spark energy and this allows spark plug gaps to be opened up to .055″. The high dwell Dyna-Module increases spark duration for more low end power. Additional benefits include quicker starting and a smoother idle. All DUI Distributors  are hand assembled checking tolerances, end play clearance and making sure all moving parts are performing super smooth. The 348-409 DUI is available in our Street/Strip version (up to 7000 rpm’s) and the Racing version (up to 10,000 rpm’s). Whether you use your engine for daily street use, towing or competition, the DUI will be the most powerful and reliable ignition system you can get to make your engine run like never before!

Please note that DUI Distributors are not ready for immediate shipping. The attention to quality and detail requires us to build each unit per order, and due to this process orders can take several days to complete before shipping out. During our busy season (March-September), build times can take slightly longer.

*The Street/Strip DUI is covered by a one year warranty. The Racing version is covered under a 30 day warranty.
*Not Legal For Sale or Use on Any Pollution-Controlled Vehicle in California.

Additional information

Weight 7 lbs
348-409 Big Block Chevy

Racing Version (Up To 10,000 RPMS), Street/Strip Version (Up To 7000 RPMS)

Color Choice

Black, Blue, Clear, Red, Yellow