For the complete story on Holley fuel systems, pick up Holley Carburetors & Manifolds . It includes the entire line of Holley products: carburetors, manifolds, fuel pumps, and filters.   In the Holley Carburetor Handbook, c oncise text explains the basics of the fuel-inlet, idle, main-metering, secondary and choke systems. Learn about the 4150/4160’s unique metering blocks. Instructions cover carburetor repairs and adjustment. And a bonus section describes how to choose a carburetor based on engine size and volumetric efficiency. More than 100 photos, charts, and drawings show you how to do it right. Mike Urich is the former vice president of engineering at Holley Carburetors.