Product Information Hydraulic - Magnum: Broad power. 2500+ stall, low gears, 9.5:1 compression and headers. Rough idle. OR Marine: Off shore type boat. Strong performance, rough idle.; 280/280 Advertised Duration, 230/230 Duration .050", .512"/.512" Lift, 110 Lobe Separation; Valve spring upgrade required; 289-302 Firing Order;
