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• Tailored for GM 602 & 604 crate engines • Melonized gear for steel hydraulic roller camshafts • Racing DUI coil & dyna-module • No add-on spark box is necessary • Special racing advance curve • Calibrated mechanical advance on a distributor machine with accurate timing curve • Each 602/604 DUI is hand built to exact tolerances • Accurate & precise trigger signals • Key parts of distributor are polished & lubed for smooth operation • DUI is test fired before leaving our facility to insure all components are working properly • Available in black, blue or red