Seloc Manual - Mercruiser Stern Drives. Covers type 1, Alpha/MR and Bravo I and II units powered by Ford and GM 4 Cyl.. In-line 6, V6 and V8 Engines. Years: 1964-1991. Comprehensive, authoritative information. Leading source of how-to-information for the marine industry since 1974. For professional mechanics, do-it-yourself boat enthusiast, instructors and students.