I have a comp cams magnum 280 cam, lifters, and springs. Worked great and made 355rwhp/400rwtq, 15" vacuum, through a c6 tranny. Everything is in excellent shape, and will work with stock rocker arms. 280 adv duration, 230 @ .050., .530 lift, single pattern, hydraulic flat tappet. Excellent shape, less than 5k miles, broken in properly.