Valve guide repair
I need to repair the exhaust valve guide on a Briggs and Stratton L-head, aluminum block, #220707. There is a bushing which is loose and can be easily removed. I figure the guide was repaired with a bushing and later the bushing came loose, or was never tight. The engine diagram refers to two different guides, one called "Guide -- Exhaust Valve" and the other, with a note "Guide -- Exhaust Valve or Intake (Brass)". When I look up these parts with the part numbers, they are called "valve guide bushings". I fully understand the bushing process and the tools involved. I do not understand what the guides in a new engine consist of. I have not found any reference to replacing the guide. Does the new engine have a guide pressed into the aluminum, which is repaired by reaming and bushing? Are a valve guide and a valve guide bushing the same thing? I would not expect a replacement bushing to fit any better than the one that is in there now.