Engine design with the camshaft located atop the cylinder head, operating both the intake and exhaust valves. SOHC V6 and V8 engines, which are designed with cylinders in two banks, have a total of two cams, one for each cylinder head. The one cam in each head operates the intake and exhaust valves, resulting in improved performance and fuel efficiency. All engines using the overhead cam design offer the potential for greater power output and higher engine speeds (rpm) when compared with overhead valve designs.