NEW Elgin Industries 1997-2007 GM LS 4.8 5.3 5.7 6.0 6.2 V-8 LS1 Hydraulic Roller Mild Racing Performance 3-BOLT Camshaft and Lifters kit. NOT FOR AFM Engine. Recommended Spring Pressures are 120# On Seat, 300# Open. CAM DESCRIPTION: Hydraulic Roller – Fair idle, good mid-range/strong top-end power, computer modification recommended. Compression: 10.5:1 minimum compression. VALVE LIFT (Intake/Exhaust): .585″/.585″ (using 1.7 rockers) ADVERTISED DURATION: (Intake/Exhaust): 283°/286° DURATION at .050″ (Intake/Exhaust): 228°/230° OVERLAP: 59° LOBE CENTER (Intake/Exhaust): 108°/116° LOBE SEPARATION: 112° RPM RANGE: 2,500-6,500 SPECIAL NOTES: Stock valve springs cannot be used. This camshaft is not compatible with Active Fuel Management (AFM). An AFM delete kit and/or disabling the AFM through the ECM is required. LS1/LS6 style sensor pick-up ring. Custom computer tuning required. NOTE: Ordering this item will require a signature confirmation upon delivery. Please ship to an address where a signature can be obtained from UPS.