Fits 351W with steel gear for hydraulic roller cams. Must be used with an MSD 6, 7 or 8-series ignition.

Part Number: 85840

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. For Ford enthusiasts that are serious about performance! Just under the brass terminals of the MSD cap and rotor is an easy-to-adjust mechanical advance assembly. The assembly is fine blanked from chro-moly steel, TIG-welded for strength plus receives a QPQ coating. The precision weights glide on nylon bushings for smooth advancement and different springs and stop bushings are supplied so a variety of advance curves can be tuned.

Features and Benefits

• Same height and width as PN 8584
• Maintenance-free magnetic pickup and advance assembly