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seating area. I don't know how can one do 14 angles on a seat or a valve. valve itself of seating and margin area is total of 4mm so seating side needs to be at least 1mm, so you are going to have 3mm to work on to make 13 more angles?. Thats why most shops do 4 angle job, each angle for each mm. You talk big sometimes. How can you do 14 angle job on a cold material? When engines is at operating temperatures and valve temperature is 1400F metal expends.
my site click on the pic. Also to read more(4mb in pdf) about Aquamist experience of TT.net members go to:[http://members.cox.net/zmanz/aquamist.pdf]

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