Ford 351W MSD Pro Billet Distributor. Pro Billet Distributor is machined from billet 6061-T6 aluminum on a state of-the-art CNC machine with exact tolerances. For high rpm stability, a steel shaft is supported by a sealed ball bearing. This shaft also receives a QPQ coating for friction reduction and resistance to corrosion. A precision machined reluctor is attached to the shaft which triggers the magnetic pick-up mounted in the housing. This high output magnetic pick-up is the most accurate way to trigger your ignition. Distributor also features an adjustable mechanical advance assembly and includes different springs and stop bushings so you can tune an advance curve to match your application. Distributor must be used with an ignition box such as the MSD 6, 7, 8 or 10 Series ignition boxes.