ANYTIME you replace valves you need to do a complete valve grind. Attempting to use lapping compound as a replacement is NOT a good plan. Reusing OE welded valves with 70K on them (how old?) is a recipe for disaster. Quality stainless steel valves are affordable and are a definite upgrade over the OE type.
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“It takes considerable knowledge just to realize the extent of your own ignorance.”
Dr. Thomas Sowell
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