Circuit Board

The MSD IGNITION Circuit Board (ASY19970) is a distributor circuit board engineered for high-performance ignition systems in big block Ford and Cleveland engines, as well as modified powerplants requiring precision electronic control. This component is essential for racers, engine builders, and enthusiasts who demand reliable spark management and consistent ignition timing across demanding operating conditions. The circuit board functions as the electronic brain of MSD's Pro Billet Distributor system, managing the precise firing sequence that modern high-horsepower engines require.

This circuit board integrates advanced solid-state electronics designed to work seamlessly with MSD's Pro Billet Distributor platform, delivering consistent trigger signals and rotor sequencing for optimal ignition advance and retard characteristics. The compact design—measuring 3.85 x 2.35 x 4 inches and weighing only 0.49 lbs—allows for efficient packaging within the distributor housing without sacrificing processing power or reliability. MSD's proven electronics architecture ensures repeatable performance across various engine configurations, from naturally aspirated big blocks to heavily modified, high-revving applications where timing stability directly impacts power output and engine longevity.

This distributor circuit board is ideal for engine builders and performance shops upgrading ignition systems on classic and modified big block Ford and Cleveland engines. Installation requires compatibility with MSD's Pro Billet Distributor assembly, and the board works in conjunction with MSD's complete ignition control ecosystem. Whether you're building a street rod, bracket racer, or street performance engine, this circuit board delivers the electronic precision needed for reliable high-RPM operation and consistent ignition management in demanding automotive applications.