This service repair manual covers MerCruiser GM V-8 454 CID (7.4L) and 502 CID (8.2L) Marine Engines, specifically Generation V and Generation VI models. These robust V-8 engines are designed for marine applications, offering reliable power and performance. The manual details various engine variants, including those with carburetor and electronic fuel injection systems, as well as different cooling and ignition configurations. It also addresses associated transmission types such as Velvet Drive, Hurth, Bravo Sterndrive, and Blackhawk Sterndrive, supporting both stern drive and inboard configurations. The purpose of this manual is to provide comprehensive guidance for the maintenance, repair, and troubleshooting of these MerCruiser engines. It includes detailed procedures for disassembly, assembly, inspection, adjustment, removal, and installation of engine components. Furthermore, the manual covers the electrical system, including the starting, ignition, and charging systems, along with instrumentation and wiring diagrams. With the inclusion of photos and illustrations, this English language service manual is an essential resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their MerCruiser marine engines.