I had MBV lifters and everything was great. Then I broke a rocker and it ate my cams. This was probably the fault of used/beat rockers. I sold the lifters and went Hydro with some C1's. After talking with Mark Mazurowski this past weekend, I'm going back to a tested/known solid setup. The dual springs that I'm getting (to prevent float) are probably too stiff for the hydro lifters. I'm not going to find out the hard way again.