MSD 8561 Iron Distributor Gear for Chevy Marine

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MSD designed this 8561 Distributor Gear for 1955-2002 Small Block and Big Block Chevy Marine MSD distributors. This gear is machined from a proprietary formulated Ductile Iron, and is micro polished for smooth contact. It also features an increased outer hardened layer thickness (RC 55-60), and Melonite QPQ coated to reduce friction and initial wear. MSD researched and tested a variety of metallurgical compositions, heat treating and coatings to provide a strong, durable distributor gear. This means long life, an easy break-in period and reliable performance! MSD 8561 Distributor Gear Features: For Chevy Small Block and Big Block Marine MSD Distributors from 1955-2002 Distributor Gear Material: Iron Distributor Shaft Diameter: 0.500 in. Distributor Gear Rotation: Standard Roll Pin Included: Yes Drilling Required: No Quantity: Sold individually From street cruisers to Top Fuel dragsters, MSD's ignition systems have been the industry leader for over 40 years. MSD continues to push the envelope with cutting-edge ignition technology as well as intake manifolds and EFI systems. Show more