The valve body in the M40 engine is brass, chose for its good strength, corrosion resistance, and ease of machining. This part serves as the heart of the valve body assembly, featuring intricate internal fine threads, a precisely machined valve seat, and carefully designed fuel passages. The internal fine threads allow for precise adjustments, facilitating fine-tuning of the fuel flow for optimal engine performance. The machined valve seat ensures a reliable and consistent seal, preventing any unwanted fuel leakage. The strategically designed fuel passages regulate the controlled flow of fuel into the engine, contributing to the engine’s efficient combustion and power generation.