Andrews N4 Series Camshafts For Harley Sportster Since its founding in 1972, Andrews Products has been acknowledged as a pioneer in the industry throughout the world of racing. Modern engineering, design, and production techniques are used by Andrews to provide camshafts of the highest caliber for the performance motorcycle market. Features: Only the best alloy steel billets and heat-treating processes are utilized Hydraulic lifters are recommended Made in the USA N4 Cam Specs: Street/drags: Stock or modified 883/1100/1200 Peak rpm range of 2000-6000 Intake open/close 30/46 Exhaust open/close 52/24 Intake duration 256/296 Exhaust duration 256/296 Intake lift at Tdc: .216 Exhaust lift at Tdc: .189 Intake lift .490 Exhaust lift .490 Uses stock springs