Description MOR97857 by MOROSO Ignition Control Module, Moroso Style 4 Pin GM HEI Distributors Ignition Module MOR97857 Fits Moroso DuraFire distributors MOR72230 and MOR72231 or any 4-pin GM HEI distributor for 4-, 6- and 8-cylinder engines. High-output module delivers consistent dwell, accurate timing, extended durability and high spark output
