This Service Repair Manual covers Mercury Mercruiser 7.4L and 8.2L V8 marine engines, built on the GM V8 Gen V & Gen VI engine families. These powerful engines are designed for marine applications, including stern drive, inboard, and ski boat configurations. With displacements of 454 cubic inches for the 7.4L and 502 cubic inches for the 8.2L, these engines are available with various fueling systems, including Carburetor, EFI, EFI/MP, and MPI. The manual encompasses a wide range of models such as MCM 7.4L Bravo, MCM 7.4LX MPI, MCM 454 Magnum, MCM 502 Magnum, MIE 7.4L, MIE 8.2L, and MIE 454 Magnum Tournament Ski, along with the Velvet Drive Transmission and driveshaft components. This comprehensive manual provides detailed illustrations, step-by-step instructions, diagrams, and pictures to assist both DIY enthusiasts and experienced mechanics. It covers essential areas including general information, routine maintenance procedures, and troubleshooting for key systems such as the starting, ignition, charging, fuel, cooling, exhaust, and power steering systems. Additionally, the manual details components like instrumentation, electrical kits, and electrical wiring. The purpose of this manual is to offer clear guidance for maintaining and repairing these Mercury Mercruiser engines, ensuring their optimal performance and longevity.