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Another thing about just trying to regrind to open one valve before the other is that, depending on the top end design, both valves might be actuated by a single rocker arm, so there's only one intake lobe/cylinder or perhaps two in the case of some variable valve timing systems, but that still leaves the rocker arm issue. Modifying the lifter on one valve for later engagement would end up in rapid wear and a hell of a racket coming from the engine.
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