Davis Unified Ignition's (D.U.I.) GM Tri-Power Ignition System is specifically designed for limit space areas where a typical D.U.I. distributor will not fit. With a smaller diameter distributor and remote mounted coil, this tri-power ignition system gives all the much needed room for when use of a blower, tunnel ram or engines mounted closer to a firewall. Featured with a Chevrolet points-style distributor housing, Dyna-Mod HEI electric module and high voltage inferno coil. This system allows spark plug gaps to be opened to an incredible .055? and a super smooth advance curve eliminates engine damaging detonation.