Buick V8 400-455 Billet Distributor Fits 400, 430 And 455 Buick Engines. Must Be Used With An 6, 7 Or 8-Series MSD Ignitionbushing hold this shaft stable at any rpm. This distributor uses a high output magnetic trigger to fire an MSD Ignition Control. Accurate trigger signals and spark delivery are the responsibility of the QPQ coated steel shaft. A sealed ball bearing and long sintered An adjustable mechanical advance mechanism is mounted on top of the shaft. Nylon pads ensure smooth movement of the fine balanced weights for accurate timing advancement. A variety of