Melling CS-MTC-8 RV Towing Camshaft & Valve Springs Kit for GM Gen III/IV LS 4.8 5.3 6.0Basic Operating RPM Range: 1,500 5,000 Camshaft Use: Towing Intake Duration at 050 inch Lift: 212 Exhaust Duration at 050 inch Lift: 218 Advertised Intake Duration: 274 Advertised Exhaust Duration: 280 Intake Valve Lift with Factory Rocker Arm Ratio: 0. 522 in. Exhaust Valve Lift with Factory Rocker Arm Ratio: 0. 529 in. Lobe Separation (degrees): 114 Camshaft Gear Attachment: 3 bolt Computer Controlled Compatible: Yes Lifters Included: No Valve