This is some shocking news! A noisy comp xe hyd cam? Really?? Sorry couldn't help it. It's not the lifters,it has nothing to do with .904 lobes or anything except the closing ramp,or lack of. Usually when this issue comes up hasn't it always been the lifters? adjustment? or some mystery? seems like it to me. You can get a great hyd(sounds all wrong to me too.LOL) camshaft that won't wear out the nerves from Tim @ Bullet cams.