I've previously had stuck valves in my O200, but I did not expect one in the O-360, with only 240 hours on it. yes, the rope trick (which can have its own problems when you get the rope wrapped around the open valve, and stuck in there). I took the valve out, in accordance with the Lycoming procedure, and used the Sunnen guide hone, which a friend brought me, to hone the guide back so the go/no go gauge fit well. I then repeated on the other three cylinders, to be sure, but they were fine. Without the help of friends, and the proper tools, I'd still be on the ramp, a long way from home - now, I'm happily continuing my trip to catch up to the group, and much further from home!