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In that case and in answer to your question, you can't. The variables are way too complex. The valves don't all start to bounce at once, the weight of the components, the valve train,(OHC or push rod?). The best way to postpone VB would be to lighten the valve gear if possible without damaging the integrity of the parts. Stiff valve springs break parts and cause rapid wear.
What type of engine and for what purpose?
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