What I do know...clearance to the valve wall is pretty critical for good efficiency,less so for maximum power(so leave at least part of the valve head full diameter)Too small at the seat will give you problems,but you can go pretty close to the mark left by the seat.
The way I do the wire probe is to straighten the bolt(they are all bent)then put it in the lathe and cut it off at the o-ring groove,then drill it for a press fit to the piano wire I use for the probe(about 3/8" depth)Then I push a section of port seal tube over the probe,cut it off,and test fit to the breach.Some reshaping of the tip of the tube is needed to get a good seal. No more blown bolt o-rings.
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