On my '94 pickup 22re. Recently I heard what sounds like valves ticking (but only under load) that hasn't gone away. Maybe it's pinging, but I don't know. It's something new that I've never had to deal with before. I checked the timing to make sure it hadn't moved. It's right at 5-6 advanced with the jumpers in.

I then did the 500 mile head bolt retorque and valve lash adjustment. Seems the lash was too loose on some and a tad tight on others.

I then did a compression test. All four had between 142-151, which is way down from previously (before I blew the last HG) which was at close to 170 on all four.

I also noticed that all four (but mainly 2-4) wouldn't hold pressure. Cylinder 4 seemed to be the worst. After putting some oil in the cylinder and retesting it held a tad better but still not good.

I've always heard that if the oil trick doesn't stabilize things, then the leak must be in the head, right?

Also, what causes all 4 cylinders to drop 20 lbs in compression at the same time?

It seems to be burning oil too, but I'm not totally sure about that yet.