41. His 173 cc overhead valve ( OHV ) model with an external flywheel proved particularly popular. 42. In contrast, Harley's biggest engine is a 1340 cc V-twin with two overhead valves per cylinder. 43. The 1955 model was powered by the overhead valve Fairlane 500, Custom 300 and Ranch Wagon models. 44. The P�trel had four overhead valves per cylinder, two exhaust and two inlet, in bronze valve guides. 45. Brage had an overhead valve petrol engine. 46. In 1977, a overhead valve ( OHV ) diesel engine from Opel replaced the outdated Perkins units. 47. The overhead valves are driven by a gear driven camshaft . Each piston has five piston rings. 48. The overhead valves had single springs but there were return springs to keep the rockers to the pushrods. 49. The Z�ndapp KS600, first released in 1938, had a horizontally opposed twin cylinder motor with overhead valves displacing. 50. From 1921 to 1926 the vehicle was powered by a four cylinder or 6 cyl overhead valve Continental engine.
