Built off MSD's tried and true billet marine distributors, this 6061-T6 aluminum housing is hard anodized in a sleek black finish. Under the black cap is a quality rotor, pickup, reluctor, and adjustable weight plate assembly (where applicable), backed by UL testing to marine ignition safety standards.
Specifications:
- Category: Ignition
- Product Type: Distributor
- Grade Type: Marine
- Color: Black
- Distributor Type: Magnetic Pickup
- Gear Material: Cast Iron, Melonized QPQ Coated
- Shaft: 0.500in, QPQ coated (Chevy applications)
- Housing: CNC machined billet aluminum housing and base, bolt-down cap, two flame arrestor holes with brass screens, black anodized
- Connector: Weathertight, locked and sealed
- Certification: UL Approved
- Warranty: Manufacturer's Limited 1 Year Warranty
- Part Number: 85603
Must be used with an MSD Ignition Control. Will not accept a vacuum advance canister.
FAQ
Is the MSD 85603 marine distributor certified?
Yes, it's UL Approved and tested to meet or exceed U.S. Coast Guard safety standards for marine ignition systems.
What color is the MSD 85603?
Black anodized.
What connector does the 85603 use?
A Weathertight Connector for a positive-lock, water-resistant connection.
What shaft size does the 85603 use for Chevy applications?
A 0.500 inch QPQ-coated distributor shaft joined by a melonized distributor gear.
Is the MSD 85603 CARB legal?
No CARB Exemption Order Number is listed for this part.

