Small/Big Block Chevy, Magnetic Trigger, Mechanical Advance

MSD85551

D85551

CNC machined billet aluminium housing and billet aluminium base Easy-to-adjust mechanical advance with supplied springs and stop bushings Maintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm range Polished steel shaft is QPQ coated and guided by a sealed ball bearing and extra long sintered bushing Advance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reduction Mechanical advance assembly can be locked out for crank trigger systems Advance weight pins are staked and tig welded to the plate Nylon pads ensure smooth operation of the advance weights Special oil tract improves lubrication to the distributor and cam gear O-ring seals can be added to modified blocks to improve oil pressure control Supplied with an HEI style di ts Cap-A-Dapts) Must be used with an MSD 6, 7 or 8-Series Ignition Will not accept a vacuum advance canister This is our most popular performance distributor! The housing is machined from a billet of 6061-T6 aluminium on a state-of-the-art CNC machine producing exact tolerances. For high rpm stability, a .500" steel shaft is supported by a sealed ball bearing and a long sintered bushing. 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. Plus, with no moving parts to wear or adjust, the pick-up is maintenance free! Just above the pick-up is MSD's adjustable mechanical advance assembly. Different springs and stop bushings are supplied so you can tune an advance curve to match your application.