This book is a must for anyone thinking about rebuilding their own 911's engine. Never-before published information details the nuances of tackling this daunting task! From dropping the engine, to reconditioning and blueprinting, through final reinstallation and break-in, dempsey guides you step-by-step through the pitfalls often experienced by even the best mechanics. Contains reliable information on parts interchange, performance modifications, reliability upgrades, tear down, and potential problems encountered along the way. Essential information for do-it-yourselfers and for those looking to hire a professional. This book provides excellent insight and information into the inner workings of the air-cooled Porsche engine.