This manual covers MerCruiser GM V8 Marine Engines, renowned for their robust construction featuring cast iron engine blocks and cylinder heads, and reliable water-cooled systems. These V8 engines, including variants like the 305 (5.0L) and 350 (5.7L) displacements, are engineered for demanding marine applications, providing dependable power and performance. Their design emphasizes durability and efficiency, making them a trusted choice for various boating needs. This comprehensive Factory Service Repair Manual in English provides essential information for the maintenance and repair of MerCruiser GM V8 Marine Engines. It details crucial procedures, technical specifications, and troubleshooting guidance necessary for owners and technicians. By following the instructions within this manual, users can ensure the optimal performance, longevity, and safety of their marine propulsion systems, adhering to recommended service intervals and fluid requirements.