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S&S Cycle chain drive camshafts are replacement camshafts specifically designed for performance bikes. Using these camshafts is one of the cheapest ways of improving engine performance of stock or modified bikes. These kits have been custom made specifically for your Harley Davidson and they will fit perfectly without any modifications. They have been manufactured with quality materials that have been heat treated for maximum strength and durability. To ensure these can be relied upon to improve performance on your bike, the kits have been thoroughly tested before leaving the factory.