Andrews TW31s Series Camshafts For Harley 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 Lower TDC lift for easy installation Made in the USA TW31s Cam Specs: Great cam for motors with 95 inches and 9.8 - 10.2 compression ratio Peak rpm range of 2400-5600 Intake open/close 10/46 Exhaust open/close 52/08 Intake duration 236/242 Exhaust duration 240/276 Intake lift at Tdc: .131 Exhaust lift at Tdc: .120 Intake lift .510 Exhaust lift .510 Uses stock springs Note: Installer must check coil bind, valve-to-valve clearance, and valve-to-piston clearance