Performer RPM Camshaft Kit; Chevy Small Block 283-400; Hyd; 1500-6500rpm; Adv Dur 310deg. Int/320deg. Exh; Valve Lift Int 0.488/0.510 Exh; Use Stock Only Ratio Rocker Arms;Designed for street high-performance applications, Performer RPM cams provide power from 1500 to 6500 rpm. General Information Manufacturer: Manufacturer Part Number: UPC: 085347071029 Characteristics Usage: Street/Performance Engine Make/Size: Chevy Small Block (262-400) Lifter Type: Hydraulic Flat Tappet RPM Range: 1000-7000 Exhaust Valve Lift (in.): 0.51 Exh. Duration @.050 in. (Deg): 244 Exh. Duration Advertised (Deg): 318 Intake Valve Lift (in.): 0.488 Int. Duration @.050 in. (Deg): 234 Int. Duration Advertised (Deg): 308