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Your valve idea appears to be a solution to a small problem which introduces several serious problems!
I can't see how it eliminates the valve guide - your big fat valve bodies must have some form of location, which would just be a very large diameter valve guide.
Those big fat valve bodies must, as drawn, affect airflow? To get them out of the airflow I suspect you'd need a much longer valve stem than you show, which would make the valve assembly much longer than a normal valve, necessitating in turn a much deeper head casting, making the engine heavier & taller.
Last but not least, your idea would result in an enormous increase in reciprocating mass, again adding weight throughout the valve train & seriously reducing engine speed.
The answer to valve heating problems is metallurgy, not mass!
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