92whitelightning

Has anyone ever experienced any problems with there cam. I replaced my lifters thinking that they were calapsed but two of the lifter are sitting lower then they are suppost to. when i turn the car on you can hear a lous tapping noise of the lifter being pushed up and hitting the H-clip..now i dont know if there is a probably with the cam or what but it just happend after putting 5k miles on the cam...