For gearheads who want to build or modify popular LS engines, How to Build and Modify GM LS-Series Engines provides the most detailed and extensive instructions ever offered for those modding LS engines through the Gen IV models. The LS1 engine shook the performance world when introduced in the 1997 Corvette. Today the LS9 version far eclipses even the mightiest big-blocks from the muscle car era, and it does so while meeting modern emissions requirements and delivering respectable fuel economy. Premier LS engine technician Joseph Potak addresses every question that might come up:Block selection and modificationsCrankshaft and piston assembliesCylinder heads, camshafts, and valvetrainIntake manifolds and fuel systemHeader selectionSetting up ring and bearing clearances for specific uses Potak also guides readers through forced induction and nitrous oxide applications. In addition, the book is fully illustrated with color photography and detailed captions to further guide readers thro