The complete and practical guide to successfully modifying cylinder heads for improved performance and economy is written and illustrated in an understandable manner that applies to nearly every automobile and motorcycle (except two-strokes). With professional race engine builder Peter Burgess showing them the ropes, readers won't waste their money on mods that don't work, and they'll gain an understanding of horsepower and torque, necessary equipment and tools, airflow, porting, valves, unleaded fuel conversions, camshafts, exhausts, ignitions, and much more.