I am an engine builder, but had never built an engine for marine use so I wanted a book to tell me the finer points. There are specific needs, like cooling systems, gasket materials, etc that are very different in a marine engine. This book says NOTHING about marine engines at all. Its a book about how engines work, period. I wanted to see things like cam recommendations, gasket tech, wet and dry exhaust tech, but its literally just a book on how engines work in general. There is NO marine tech in this book at all except a brief chapter on how propellers work. Very disappointing.