Small/Big Block Chevy, V6, .500" shaft diameter, Melonized, Roll Pin Included

MSD8561

D8561

Increased outer hardened layer thickness (RC 55-60). Micro polished surface for smooth contact. Proprietary formulated ductile iron. Melonite QPQ coated reduces friction and initial wear. Interstitial carbide concentration improves wear resistance and running properties. Melonized for use with hydraulic roller camshafts. For aftermarket distributor with 0.500" diameter shaft. A distributor's performance is only as good as its drive gear. MSD Ignition has put a great deal of effort into researching and testing a variety of metallurgical compositions, heat treating and coatings to provide you with a durable, accurate and strong distributor gear. MSD engineers have built test fixtures and spent hundreds of hours testing and evaluating the metallurgy of our gears. The result is a special iron alloy gear that is treated to a low friction cess. To you this means long life, an easy break-in period and reliable performance