Thought I'd give anyone following a bit of an update. I called around to 5 or 6 machine shops. Almost nobody has the equipment to machine valve seats on a flat head engine anymore. Everyone has moved on to machining valves on heads. I did get referrals to shops who could potentially do it, but they all refused the work.
They said that from their past experiences, they are highly likely to strike water due to water jacket and other corrosion.
But yes, this block can in theory be machined by drilling out and installing new valve seats.
Last edited by infy; 05-20-2019 at 01:21 PM.
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