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Thanks for all those good points. As stated the engine has never been rebuilt. I will discuss more with my machinist when we talk about increasing the over bore. I know the valve seats will need a little tidying up though. So in my mind I'm thinking that valve stems that have never been ground and a tidying up of the valve seats should mean that the valves should be long enough and may need a little trimming. Will measure the length of the valve. Hopefully paying a visit to the machine shop next week.