An "overhead cam" (OHC) refers to a type of engine design where the camshaft is located above the engine's cylinders. This setup allows for more precise control of the engine's valves, improving performance and efficiency. OHC engines can be found in many modern vehicles, as they help reduce weight and complexity compared to older designs. There are two main types of overhead cam configurations: single overhead cam (SOHC) and double overhead cam (DOHC). SOHC engines have one camshaft for both intake and exhaust valves, while DOHC engines have separate camshafts for each, allowing for better airflow and higher engine speeds.