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Well, I wouldn't know how to ABA test such a thing, because it would take most of a day in between runs, allowing too many conditions to change. But the engine sounds differently (I think a little louder). And my FE has not suffered, though I can't tell if the valve setting has anything to do it. My primary goal was emissions test prep. And my smog test went smoothly. A side effect seems to be that it *might* help fuel economy at the same time.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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