compression was 75, 20, 20, 75. Valve timing was good. Valves look good (no burnt holes), but I haven't gotten into them closely. Previous owner says she just got in one morning and it wouldn't start. Did sound funny cranking, like compression really was off. Cyl 3 is wet with oil but 2 is dry. All have flaky carbon buildup on piston tops; cross hatching still visible on cyl walls. Plugs have nothing to say. There's a code for a rear o2 sensor heater and most of the I/M monitors are good, so it wasn't missing. Oil and coolant were where they should have been. Had new looking green coolant (originally dexcool, of course). Gasket had a big tear but I had to reef on the head to pry it off. This might have done it. All fire rings intact. It is showing some "not great" signs of fiber swelling, but I don't know if it's completely done yet. Even if I had the worst piston rings in the world I should have way more than 20 PSI. I'm stumped! I do have a spare head I'll probably wind up sticking on. Thoughts?