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Quite interesting. Judging by the wear offset on the peak seal, the peek is fully supporting the pressure. The steel cone is probably just for centering and to provide the shoulder to pull back the the seal? I was planning on replacing the C1 bumper with peek. Seeing this, I should probably do...

Many Thanks! For my purpose, I will be enlarging the throat diameter in the lathe. From past experience, when boring seats, it may leave a bur resulting in a slow leak. Lapping and polishing will usually prevent that. I would rather just go ahead and do it since the valve housing is already...

I'm looking to make a valve seat polishing tool like the one from member bigHUN : The question is, does anybody know what the conical angle is? Unfortunately, I don't have any metrological gear capable of measuring it off the valve pin accurately.