Just as the V-8 engine is the center of gravity in the muscle car and hot rod world, the modern, small-displacement four-cylinder engine is the foundation for today's performance universe. Unfortunately, dry factory-service manuals have been the only literature available to someone wanting to work on one of these high-tech motors--until now. This book tells readers how to get the most out of their modern engine, whether they are building a high-revving, all-motor engine or are planning to use nitrous oxide, turbocharging, or supercharging. Automotive writer Robert Bowen provides comprehensive, step-by-step instructions for rebuilding a typical high-tech four-cylinder engine, breaking down the process so readers who have never torn down an engine will be comfortable doing so.