Which type of valve arrangement has the valves located in the cylinder head?

The type of valve arrangement where the valves are located in the cylinder head is known as the overhead valve configuration. In this design, the intake and exhaust valves are positioned above the combustion chamber, allowing more efficient airflow into and out of the cylinder. This placement contributes to better engine performance by improving breathing, which is essential for higher power outputs and efficiency.

Overhead valve arrangements are often found in modern engines due to their ability to achieve higher compression ratios and facilitate more effective gas exchange at various engine speeds. This configuration allows for more advanced timing and control of the valves, leading to improved efficiency and power compared to other designs.

In contrast, other valve arrangements like flathead and L-head configurations have their valves located within the block or in the side of the cylinder, which can limit airflow and performance. The in-block design, for example, places the valves within the engine block, leading to less optimal performance characteristics compared to the overhead valve design.