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Completely (well almost) agree with Bonnietiler. Don't think the seats are made from cast Iron but the theory is GOOD. Unless they are pocketed JUST RUN IT :hammer:
Use chrome stem valves and Phos bronze guides, NO OIL SEALS. You can put an 'O' ring on the valve stem AND machine the top of the guide at 45 degrees for half the thickness. This will allow some oil to lube the valve stem but when it is fully open, seal off the top so that the vacuum does not pull any more oil into the combustion chamber.
The machining helps stop oil build up on top of the guide.
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