I had to replace a cylinder head this weekend and when I took off the intake I noticed that the #7 Exh. push rod was loose and the lifter appeared to be sitting lower than all of the other lifters. The lowest all of the other lifters go is about flush with the top of the bore but this lifter goes down about a millimeter below the bore. I tried to take the lifter out but I can only pull it up about half an inch and then it gets stuck. I tried turning the crank and this lifter does not come up as high as all of the others. Does anyone know whats wrong with this lifter? Is there something wrong with my cam or did I maybe overtighten this rocker arm?