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Reply to "Stroker engine vibration"

Of course there is no way to truly diagnose this via email so one hypothesis is as good as another. I suspect the balance of the new flywheel is not consistant with the steel flywheel. Or, perhaps the new flywheel's bolt holes are drilled slightly different from the steel wheel. Or, maybe they didn't zero balance the pressure plate very well and it doesn't complement the new flywheel. Or, perhaps the bolt holes for the pressure plate on the aluminum flywheel are slightly askew from the steel flywheel creating an imbalance.

This is a frustrating problem and I have felt your pain in the past. Difficult to correct without taking the new parts back to the machinist for balance.
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