This is our most popular performance distributor. Must be used with an MSD 6, 7 or 8-series ignition.

Part Number: 85551

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. 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" 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.

Features and Benefits

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