“This book is regarded almost as a bible by some tuners, partly because Passini gives us such a wealth of detail and practical knowledge about each of the Webers has dealt with, accompanied by clear diagrams and drawings of the relevant bits and with tables of jet sizes for different purposes. Not everything is covered of course, but there is enough genuine info here for most people to join up the dots for their own specific applications. This edition was published in 1972, and the world has moved on since, but for a classic car from before then it is still relevant.”