This manual covers Weber DCOE and Dellorto DHLA carburetors, renowned Italian manufacturers celebrated for their high-performance designs. These twin-choke, side-draught carburetors have been integral to countless motorsport victories and performance road cars since their peak production era through the 1960s, 70s, and 80s, remaining popular in classic and performance tuning circles. They are recognized for their robustness, adjustability, and significant potential for enhancing horsepower, torque, and throttle response in a wide range of 4-cylinder, 6-cylinder, and V8 performance engines. This manual focuses on building, tuning, and powering these iconic carburetors for optimal performance and drivability.

The purpose of this comprehensive guide is to provide in-depth knowledge and practical instructions for owners, mechanics, and technicians working with Weber DCOE and Dellorto DHLA carburetors. It details carburetor disassembly, reassembly, cleaning, and rebuilding, with step-by-step instructions and clear diagrams. The manual also covers essential tuning procedures, including jetting, calibration, float level adjustment, and idle mixture settings, to achieve maximum power and responsiveness. Furthermore, it offers detailed troubleshooting and diagnostic guidance for common issues, ensuring these performance carburetors maintain their reliability and deliver peak performance.