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.;<br><br>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.<br><br>Different springs and stop bushings are supplied so you can tune an advance curve to match your application.<br><br>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