Magnum Cams are specifically designed for the Street Enthusiast looking for more power with that Pro Street sound! The idle characteristics of your engine will change due to the increased duration and overlap. SOLID: Maximum street performance, very rough idle, needs headers, 3000 stall and 9.5:1 minimum compression. RPM Range 2500-6500 Advertised Duration 294/294 Duration @ .050 248/248 Lift .525/.525 Lobe Center 110°