I just changed cams, to a more fuel inj. friendly cam. Solid street roller, the other cam was w/in .006 of what is was supposed to be, measured at the retainer, this cam is .026 short on lift , measured the same way , so I know that its the cam cause all the rest of the parts in the valve train are the same . I think compcams just threw it out there on the machine work !! Really dis appointed in them !!