MSD 85557 Pro-Billet Distributor for Chevy V8 with Black Cap

The MSD 85557 Pro-Billet Distributor is a high-performance ignition distributor engineered for Chevy V8 engines. Precision CNC-machined from billet aluminum, this distributor delivers reliable spark distribution and features a locked mechanical advance design ideal for racing and performance applications.

Key Features:

• CNC-machined billet aluminum housing and base for maximum strength and precision
• Mechanical advance assembly with easy adjustment using supplied springs and stop bushings
• Advance can be locked out for use with crank trigger ignition systems
• Advance weight pins are staked and TIG welded to the plate for durability
• Nylon pads ensure smooth, consistent operation of the advance weights
• Special oil tract design improves lubrication to distributor shaft and cam gear
• O-ring seal provision for modified blocks to enhance oil pressure control
• Black distributor cap included

Important Notes:

• Must be used with an MSD 6, 7, or 8 Series Ignition Control box
• Does not accept a vacuum advance canister (mechanical advance only)
• No CARB exemption—not legal for use on pollution-controlled vehicles in California

This distributor is designed for serious performance applications where precise timing control and durability are essential. The billet construction and adjustable mechanical advance make it ideal for drag racing, circle track, and high-performance street engines.