This manual covers Continental aircraft piston engines, specifically models A50, A65, A75, and A80. These horizontally opposed, air-cooled engines are known for their robust engineering and reliability in aviation applications. The engines feature magneto ignition systems, with fuel delivery handled by either fuel injection or carburetor systems depending on the specific model. This comprehensive documentation is designed to support the long-term operation and performance of these critical aircraft components. The purpose of this English-language manual is to provide detailed information for the overhaul, repair, and maintenance of Continental aircraft engines. It includes a wide array of resources, such as operator's manuals, illustrated parts manuals, engine overhaul service manuals, fuel injection and carburetor service manuals, and troubleshooting guides. This extensive collection of documentation ensures that owners, mechanics, and technicians have access to the necessary procedures, technical specifications, and part identification to effectively maintain and service these engines, ensuring optimal performance and longevity.