All, I could use some advice on fixing a smoking engine issue. I don't have the engine back together yet and want to cover all bases before I button things up. The exhaust valve seal looked "OK", though I have replaced it already.Exhaust port deposits point toward oil leaking in the exhaust valve area. There is corrosion marking and some pitting in the cylinder, indicating that the engine was sitting on the side-stand with water intrusion for a while sometime in the past. The engine runs (ran) well before taking it apart, so I'd like to avoid a re-bore and all that goes with it. Does anyone have experience with heavy white smoke? What are the chances that it needs to be re-ringed and possibly re-bored? What are the chances that the exhaust valve seal will fix the heavy smoking issue? Thanks!