MSD - 8584 - Fits 351W with iron gear. Must be used with an MSD 6, 7 or 8-series ignition.

The steel shaft that spins the advance and reluctor receives a friction reducing coating plus is guided by a sealed ball bearing and long sintered bushing. This combination provides stable timing signals and spark delivery at any rpm. Triggering chores are handled by MSD's race proven, maintenance-free magnetic pick-up.