Product Description Specifications Hydraulic - Thumpr Retro-Fit: High performance street, stock converter ok, best with 2000+converter and gears. Choppy/thumping idle.; 279/297 Advertised Duration, 227/241 Duration .050", .490"/.475" 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: 35-600-4 Proposition 65: Y Special Order: Y