Product Description Specifications Hydraulic - Mutha' Thumpr: High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.; 287/304 Advertised Duration, 235/249 Duration .050", .510"/.495" Lift, 107 Lobe Separation; Valve spring upgrade required CARB: This product is not CARB Legal and not for sale in California Category: Engine Components>Camshafts Core: N LTL: N MPN: 11-601-4 Proposition 65: Y Special Order: Y