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How did you know you had your valves rubbing against your cylinder walls?
I guess if your rings are sealing its fine, but No4 cyl ring could worn faster....
The engine had some problems and I didn't know they were rubbing until I tore it down, the Ex. guides on that head were junk as well. Funny thing is they didn't rub on the other bank???
Not to worried about that rusted cylinder, it's going into a mud truck and will be hammered on when it's running. Might smoke a bit from time to time he'll just have to deal with it.