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Message: <blockquote data-quote="5.0kid" data-source="post: 731927" data-attributes="member: 10487">Ok, so my 347 stroker is finally up and running! but there is a problem...it seems like the engine isn't balanced correctly or something. Once I'm over about 2500rpms, it shakes badly. My tuner said that this is what it seemed to be.It was balanced by eagle and I have missed placed the information for it, but it did originally come with a harmonic balancer part PB1070-N, which is a bower bond piece with a 28.2 oz imbalance. I also received a flexplate with the engine which was a pioneer piece, but i'm still trying to come up with the part number since I have misplaced that too. I'm calling pioneer on monday to check. Anyway, then I ended up buying a fidanza or ram aluminum (can't remember) flywheel with a 28oz imbalance. Could the 28oz vs 28.2 oz imbalance be the reason I'm getting the vibration? I don't want anything to happen to my new engine, any ideas would help!</blockquote>