Distributor Cap - Marine Black

The PERTRONIX IGNITION Distributor Cap in Marine Black (part number D651700) is a purpose-built ignition component designed for 8-cylinder marine engines requiring reliable spark distribution in saltwater environments. Built with socket-style brass terminals and a twist-lock design, this marine distributor cap delivers consistent electrical contact and secure retention even in the harsh corrosion conditions typical of offshore and freshwater boating.

The non-vented design prevents moisture intrusion—a critical advantage for marine applications where humidity and salt spray accelerate corrosion of ignition components. Brass terminals resist oxidation better than standard alternatives and maintain lower resistance across the contact interface, reducing voltage drop and ensuring cleaner spark delivery under throttle load. The twist-lock terminal design eliminates the risk of cap separation during rough seas or heavy acceleration. Black marine-grade finish matches standard marine engine bay aesthetics while providing additional protection against UV degradation and environmental exposure.

This distributor cap fits 8-cylinder marine engines and is engineered for both weekend anglers maintaining reliable trolling systems and serious offshore operators running extended patrol operations. Replacement is straightforward and requires no special tools—simply untwist the terminals and secure the new cap. Serious boaters know that ignition reliability directly impacts engine start response, fuel efficiency, and overall reliability at sea. PERTRONIX components are recognized in the marine aftermarket for their resistance to saltwater corrosion and consistent performance across temperature swings common in open-water operation.