Checked the cam timing. TDC both lifters are at the bottom. 1 turn of the crank and the exhaust lifter is up as it should be. Tried to push the lifter down and it is rock solid with no movement. The center should move as it is a hydraulic. I pulled 2 lifters and took them apart, drained the oil and they push down like I would expect. Is it possible that they are all pumped up and acting like solid lifters keeping the valves open? If so how does one keep that from happening?