The complete practical guide to successfully modifying classic/retro 2-valve cylinder heads for maximum power, economy and reliability. Applies to almost every car/motorcycle (not 2-stroke) and to all road and track applications. Features– New! Revised and updated edition – complete with extra illustrations – of this best-selling SpeedPro title. – The complete practical guide to successfully modifying cylinder heads for maximum power, economy and reliability. – Understandable language and clear illustrations. – Avoids wasting money on modifications that don't work. – Applies to road and track applications, and almost every car/motorcycle (not 2-stroke engines). – Peter Burgess is a professional race engine builder. David Gollan B ENG HONS is a professional engineer.