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A few people have said the main reason for the wear is inferior oil.
As I said, unfortunately the engine came with no history so I have no clues what sort of life it's had - some of it is in good shape and some of it is 'disappointing'.
It's clearly been fully rebuilt in the past so what I'm trying to work out is whether items like the valves were replaced or just re-seated. The safe option is just to replace but there is obvious cost involved and if they are still well within limits then maybe keep them?
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