Improve the performance of your modified engine. Whether youve done a cam swap or bolted on a carb intake and headers. The MSD digital 6-series ignition modules produce multiple sparking circuitry and high output power to improve the starting ability idle quality and throttle response. All of the MSD ignitions can be installed on 4 6 or 8 cylinder engines equipped with 12 volt negative ground electrical system and a distributor. They can be triggered by points electronic amplifiers or magnetic pickups. Available models are the digital 6A and 6AL the only difference is the addition of a adjustable rev limiter.