This Service Repair Workshop Manual covers Mercruiser GM V-8 Marine Engines, specifically the Gen. VI and L-29 generations. These engines, available in 454 CID (7.4 Liters) and 502 CID (8.2 Liters) displacements, feature a V-configuration and Multi-Point Injection (MPI) fuel systems. They are designed for marine applications, incorporating specialized marine cooling and exhaust systems. The manual details coverage for various sterndrive and inboard models, including the MCM 454 Mag MPI, MCM 502 Mag MPI, MCM 7.4L MPI, MIE 454 Mag MPI Horizon, MIE 8.2L MPI, and MIE 7.4L MPI, with specific serial number ranges provided for each. This comprehensive manual is designed to assist owners, mechanics, and technicians in the maintenance and repair of these Mercruiser engines. It provides detailed information on essential procedures, including engine removal and installation, as well as in-depth guidance for the engine electrical system, fuel system, cooling system, exhaust system, drives, and power steering. The manual serves as a crucial resource for ensuring the optimal performance and longevity of your Mercruiser marine engine.