This manual covers the Continental Motors Corporation W-670 radial aircraft engine. Known for its robust design and reliability, the W-670 is an air-cooled, 7-cylinder radial piston engine with a displacement of 670 cubic inches (11.0 liters). It typically produces between 220-240 horsepower and was a common powerplant for various light aircraft and trainers from the 1930s through the 1950s, including models from Stearman, Waco, and Stinson. The engine features a direct drive transmission and requires aviation-grade mineral oil. This comprehensive Service & Parts Manual / Overhaul Manual, published in English as of January 2011, provides essential information for maintaining and repairing the Continental W-670 engine. It details technical specifications, including bore, stroke, compression ratio, and fluid capacities, along with scheduled maintenance procedures and recommended overhaul intervals. The manual also includes a parts catalog, making it an indispensable resource for owners, mechanics, and technicians seeking to ensure the continued performance and longevity of this historic aircraft engine.