MSD 8560 Pro-Billet Marine Certified Distributor Chevy V8

The MSD 8560 Pro-Billet Marine Certified Distributor is purpose-built for Chevy small block and big block V8 engines operating in demanding marine environments. Where water spray, salt exposure, full-throttle acceleration, and constant vibration can destroy ordinary distributors, the 8560 is engineered to thrive. The housing is CNC-machined from 6061-T6 billet aluminum for a porosity-free, rigid structure, while the QPQ-coated steel shaft is supported by a sealed ball bearing and an extra-long sintered bushing for reliable high-speed stability.

Internally, MSD's race-proven magnetic pickup delivers consistent trigger signals across the entire RPM range. The mechanical advance assembly features QPQ-coated chrome moly steel advance plate and weights for superior corrosion resistance, with nylon pads ensuring smooth weight operation and advance weight pins that are staked and TIG welded to the plate. Three sets of advance springs and stop bushings are included so you can fine-tune the ignition curve to your specific application. The mechanical advance can also be fully locked out for use with crank trigger systems. A special oil tract improves lubrication to both the distributor and cam gear for extended service life.

For marine safety compliance, the distributor cap is bolted down to the aluminum base and features two brass-screened flame arrestor holes machined directly into the base — a critical design that prevents ignition of fuel vapors that can accumulate in enclosed engine compartments. All electrical connections use weathertight locking connectors for a water-resistant, positive-lock seal. This distributor has been tested by Underwriter's Laboratory (UL) and is certified to meet or exceed U.S. Coast Guard safety standards for marine ignition systems.

Key Features:

• CNC-machined 6061-T6 billet aluminum housing — no porosity, no weak spots
• QPQ-coated shaft guided by sealed ball bearing and extra-long sintered bushing
• Race-proven magnetic pickup for stable trigger signals throughout the RPM range
• Chrome moly steel advance plate and weights — QPQ coated for corrosion resistance
• Nylon advance weight pads for smooth operation; pins staked and TIG welded to plate
• Mechanical advance lockout feature for crank trigger system compatibility
• Special oil tract for improved lubrication to distributor and cam gear
• Bolt-down HEI-style distributor cap and rotor included
• Dual brass-screened flame arrestor holes machined into distributor base
• Weathertight locking connectors for sealed, water-resistant electrical connections
• UL Approved — certified to meet U.S. Coast Guard marine ignition safety standards
• Does not accept a vacuum advance canister
• Requires use with an MSD Ignition Control

Includes three sets of advance springs and stop bushings with detailed adjustment instructions. Sold individually.