TwinTurbo.NET: Nissan 300ZX forum - Is this a knock?
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Subject Is this a knock?
Posted by Diplomat1 on October 03, 2017 at 1:06 AM
  This message has been viewed 161 times.
Message Well I think I might have a knocking issue. I got a set of 48p heads which came off a motor that blew the bottom end. I cleaned the head and replaced all the valve stem seals. Put motor together and now it's making this noise. I got the car non running so I don't know is this bottom or top end. I am running 20w50 oil. Car runs perfect it's just this rattle/knock I get on acceleration only when I left off the gas knock stops. The noise usually starts around 2500 and up to around 4-5k. Other than this issue car runs on all 6 and strong. Here a video. Any ideas? Thanks

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