This guide to turning and modifying Holley carburetors for peak performance and reliability begins by discussing carburetor theory, project planning, and the tools necessary to complete the modifications described. Individual chapters cover a range of topics; selecting a carburetor; installation; tuning circuits; manifold considerations; forced induction; fuel pumps and fuel lines; current environmental regulations; air cleaners and filters; and fuels and fuel system mathematics. Illustrated with photographs and diagrams, the guide also uses case studies to explain the addressed topics. Rob Watson is an engineering consultant in Ridgetown, Ontario.