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valve clearance pushrod ohv over head valve rocker arm valve clearance pushrod adjuster for valve clearance roller cam follower cam lobe adjusts clearance by effectively shortening or lengthening the pushrod this method of valve operation is used on many U.S. made v8 engines and also on Harley-Davidson motorcycles sidevalve side valve flathead valve clearance cam shaft cam lobe this method of valve operation was once used on automobiles until about 1950 when overhead valves became popular and more effective this type of valvetrain is still used on many small engines such as lawnmowers snowblowers etc