I have owned an earlier print run of this book for years and can say, as someone who has been rebuilding, modifying, designing and building engines for over 40 years, that, like 'Machinery Handbook' (which caters for machinists) this book is equally complete. In other words, if it isn't in there, it doesn't exist. The author's command of engine design and, importantly, how all the various parts interact, is second to none. Whether you just need to know that you have the appropriate size valves in your engine - or whether you are contemplating making a new camshaft or crankshaft - it's all in there. The sections on camshaft timings and exhaust systems alone are worth many times the cost of the book. Pity more of those so-called 'engine tuners' (including some household names) don't buy this book.