DESC: Lunati 30207 Street/Strip Chevrolet Big Block (1967 - Present) Hydraulic Cam Street/Strip Chevrolet Big Block (1967 - Present) Hydraulic; Rough idle. Excellent cam for high performance street and strip applications. Needs 3000-3500 RPM stall converter, headers, 10:1 compression ratio and 4.10 gearing. Works well in jet boats.Features: Advertised Duration IN/EX: 308/308;Duration @.050 IN/EX: 244/244;Gross Valve Lift IN/EX: .572"/.572";Lobe Sep Angle / Intake Ctr Line: 110/108;Valve Lash IN/EX: Hyd/Hyd;RPM Range: 2800-6300Installation Notes: Regardless of your particular choice of lifter design (hydraulic, solid, hydraulic roller or solid roller) Lunati Cams always recommends the use of new lifters when installing a new camshaft. When utilizing a hydraulic or solid lift flat tappet cam Lunati recommends following all break in procedures outlined in our installation instruction sheet (part # INST150) due to the nature of today?s aggressive camshaft designs. If there are any question