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@Overuser155208
That string method is old school, but is the something special about the valve seals that are difficult to remove/refit or need a special tool?
Are there guides for the valves in the head that may need replacing? https://4.bp.blogspot.com/-Tb63hLwgHMk/WL23xskIO8I/AAAAAAAAAgQ/3wb_W6okfUY_idINsxCKX7FBScv2Pfj6ACLcB/s1600/seal3.jpg image nicked from the internet maybe he has the special tool to remove the guides.
Edit: is the engine ohc and needs a special tool for the dismantling and reassembling the cams/springs that is easier done with the head off the car?