I have a brand-new old stock Manley Thunder Stick BBC mechanical camshaft never ever set up or run,.520 consumption and.540 exhaust lift,264 and 270 degree duration @.050 lift and 110 degree lobe separation angle, this is close to L-88 427 specifications, a bit less lift, exact same huge period, operating variety has to do with 3500 to 8000 RPMs, very much a roadway race camera, most likely a terrific jet boat cam show contact info.