Thanks for that information Mike. Yes, that is just the right kind of abuse of the machine to cause the valve guide to loosen and shift, so you probably have nothing to worry about once the Loctite has stabilised. I will mention two other points, though.
First, from what I read on the internet it is not all that uncommon for GCV engines to have their valve guides shift as yours did. Of course, it may not be all that uncommon for people to let them get their cooling fins blocked with grass, mud, or whatever, so the fact that it happens occasionally to other people may not be a bad sign.
Second, when engines are severely overheated, as it seems yours has been, there are often other adverse effects. These include temporary lubrication failure due to the oil being overheated, with consequent effects on the cylinder bore and piston rings. Fixing the lubrication by removing the grass/mud and changing the oil cannot undo whatever damage has already been done.
Having issued those warnings, it nevertheless sounds very positive. If your engine doesn't emit blue smoke or use oil, and if the compression turns out to be OK, I think it will be back on track for a long and useful life.
