"SU Carburetters, Tuning Tips and Techniques" Brooklands Books
Reveals the mysteries of S U carburetors & fuel pumps! Every aspect is covered: how they work, service and repair, jets and needles, and which cars used which pump/carb. Use this with the SU video (Part number VID004) and you'll find yourself an SU expert!
This book goes further into theory including chapters on the burning characteristics of different mixtures, carb size selection criteria, use of race gas and more.