Sticky valves and corrosion, next steps
Thanks to all who have weighed in. My next steps will include reworking the exhaust hot section to reduce the splashback/moisture issues that appear to be the primary cause of internal corrosion of the manifold and #4 valves. I'll replace the third manifold stud and look for internal leaks. And I'll regrind those seats by hand (to avoiding pulling the motor), unless guide wobble indicates a deeper problem. I've also identified and am addressing a leak in the heat exchanger that could be the primary source of external corrosion issues that became apparent earlier. Thanks again.
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