New revised and updated edition, complete with extra illustrations, of this best-selling SpeedPro title.Expert advice on building and modifying cylinder heads for high performance with reliability. Topics include horsepower and torque, equipment and tools, airflow, building a flowbench, porting, valves, unleaded fuel conversion, camshafts, exhaust system, ignition and cylinder heads, except 2-stroke. The complete practical guide to successfully modifying cylinder heads for maximum power, economy and reliability. Understandable language and clear illustrations. Applies to almost every car/motorcycle with a 4-stroke engine. Also applies to road and track applications.