First published more than 30 years ago & in continuous print ever since this remains one of the most comprehensive references available to the enthusiast engine tuner & race engine builder Drawing on the author's many years of practical experience in tuning & modifying high-performance road rally & race units every aspect of an engine's operation is explained & analysed Detailed modifications & improvements are suggested & described in the author's practical down-to-earth style making this book essential reading for anyone involved in building high-performance engines