MSD 85551 Distributor

Compatible with Small and Big Block Chevy®. This product is not created or sold by Chevy®. This is our most popular performance distributor! Must be used with an MSD 6, 7 or 8-series ignition.; The housing is machined from a billet of 6061-T6 aluminum on a state-of-the-art CNC machine producing exact tolerances. For high rpm stability, a .500 in. 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 reluctors the magnetic pick-up mounted in the housing. This high output magnetic pick-up is the most accurate way to reluctor your ignition. Plus, with no moving parts to wear or adjust, the pick-up is maintenancefree! 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. Must be used with an MSD 6, 7 or 8-series ignition.;

CNC machined billet aluminum housing and billet aluminum base Will not accept a vacuum advance canister Must be used with an MSD Ignition Control Supplied with an HEI style distributor cap and rotor (accepts Cap-A-Dapts) O-ring seals can be added to modified blocks to improve oil pressure control Special oil tract improves lubrication to the distributor and cam gear Nylon pads ensure smooth operation of the advance weights Advance weight pins are staked and tig welded to the plate Mechanical advance assembly can be locked out for crank trigger systems Advance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reduction Polished steel shaft is QPQ coated and guided by a sealed ball bearing and extra long sintered bushing Maintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm range Easy-to-adjust mechanical advance with supplied springs and stop bushings No CARB Exemption Order Number