Crane CompuCam camshafts have special profiles designed to improve engine performance without sending the computer into fits or causing the stalling surging and drivability problems some computer-compatible cams are known for. Cams are 50-state-legal and come with lifters. This part carries CARB E.O. number D-225-19 for use in California on GM 350 TBI engines in 1981-87 passenger cars and trucks. Designed specifically for 1981-87 TBI 350 engines only will not work in 305! Special Note: Computer engines require a highly unique lobe profile to be compatible with the vehicles electronic capabilities. The cam specifications for Crane CompuCam camshafts should not be compared to other non-computer controlled cam specs. Specifications: * Advertised duration: 264 intake/274 exhaust * Duration at .050 in.: 204 intake/214 exhaust * Gross Valve Lift: .423 in. intake/.446 in. exhaust * Lobe separation: 110 degrees * RPM range: 1500 to 4500 * For use with 1981-87 TBI 350 engines only.