Knock at high rpm's???
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I notice my car makes a very bad noise! Remember those plastic machine guns you'd buy as a kid that made like a clicking noise as you'd pull the trigger? My car makes this sound when you rev it up and let off, this is when it makes the knock, say around 4-5k. I almost think it comes from the passenger side valve cover/head area. Some say it could be a lifter of rocker arm. Any ideas? I'm getting ready to take it apart?