Brian, Yes, sadly so. Twice, both times the center went. Second time that and the rear. These are not fed through cam, but by a drilling along side, that then ports through bearing holes. The holes WERE lined up, but of course, once the insert spins, that stops. Cam bearings were line bored and the cam turned freely when newly built (both times). Clearances were .002-.004 first time, a little larger second round. Does anyone know what was stock spec? Yes, all clean (tanked). And cam was straightened and touch ground smooth, both times.