Shawn, if you look at the last picture you will see the valve's mating surface, which is the larger beveled face toward the the top of the valve facing down toward the stem. That's the main area of valve/block interface for sealing the combustion chamber. As long as there isn't a hole through the other faces or signs of significant weakening, more than often corrosion isn't a major problem.
I'm old school enough to still own a set of lapping tools (suction cups on sticks, really) that I use to finish honing the valve and seat once any major grinding is done or to just clean up the surfaces when removing carbon and gunk. Just a little dab of grinding compound and a few hours of patience and your rewarded with a beautiful seal between the surfaces. It's mind numbing work, sort of like trying to rub a stick into a pile of wet tinder to start a fire, buy I love the results.
I'm old school enough to still own a set of lapping tools (suction cups on sticks, really) that I use to finish honing the valve and seat once any major grinding is done or to just clean up the surfaces when removing carbon and gunk. Just a little dab of grinding compound and a few hours of patience and your rewarded with a beautiful seal between the surfaces. It's mind numbing work, sort of like trying to rub a stick into a pile of wet tinder to start a fire, buy I love the results.
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