Comp Cams 54-467-11 LSR Roots Blower Camshaft for 1997+ Gen III IV GM LS EnginesLSR Roots Blower 239 243 Hydraulic Roller Cam for GM LS GEN III IV Best in street strip LS applications equipped with a Roots type supercharger Grind Number: 289LRB HR14 Engine Family: GM LS GEN III IV 3 Bolt 8 Cylinder (1997 2015) RPM Operating Range: 2,400 7,000 Cam Type: Hydraulic Roller Lifter Style: Hydraulic Roller Camshaft Series: LSR Roots Blower Camshaft Gear Attachment: 3 Bolt Valve Springs Required: Yes Camshaft Material: Billet Steel