Wow, it seems slow in this section!
Anyways, I drove it for half an hour last night and it runs great and then I ran it for a few minutes today before checking the compression. #4 was at 170 and the rest around 190-200. I have no idea what's #4's problem, but I'm not tearing it apart for 20-30 psi. Maybe it's just something stuck in the valve seat, or maybe it's a broken ring, but until it gets worse, she's on the road. .
So how come so quiet in here?