Quote:
Originally Posted by ThirstyThirty
I am not a valve grinder/cyl head guy... but have done my share of clean up work. have my own hand tools, lapping compounds, etc. I always thot the final work, prior to parts clean up was hand lapping in the seat and face... to ensure best possible concentricity and sealed setting seat.
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What you say is VERY true for those two pieces.
Look up on the Internet "generation of a surface plate." It takes three plates to get it NEARLY perfect.
And even this is more a matter of your endurance and how much out of perfect you can tolerate.
And you kind of learn the limit of practicality when the heat of your hand changes the "rub."
Those who do this for a living wear gloves.
Joe K