This manual is a must-have for any owner of a Mercruiser Stern Drive boat from 1964-1985. Also includes 1986-1987 TR and TRS models) It provides comprehensive information on the operation and maintenance of your boat's engine and transmission system. In addition, it includes valuable information on other models of Mercruiser Stern Drive boats.With this manual, you will be able to keep your boat's engine running smoothly and efficiently. It covers all aspects of the boat's engine and transmission system, including troubleshooting and repair tips. Whether you are a professional mechanic or a DIY enthusiast, this manual is an invaluable resource for any Mercruiser Stern Drive boat owner.