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How does the valve feel in the guide on its own with the cam gear disconnected, is it moving freely and smoothly? as Utopia says, i'd check the valve head was seating properly in the port. I once bent a valve in my M900. The stem was straight as a die but the head was just slightly bent off square, caused by moving an engine when the belts were off. (When you say you moved the engine, did it turn with the belts off too?) If so, you'd end up damaging the cam and the closer (as i did by turning it over) and possibly the shim as the closer gap could go below zero. If that makes sense.
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