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LS3 possible balance issue

Old 03-13-2019, 11:46 AM
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Join Date: Dec 2016
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Default LS3 possible balance issue

Recent rebuild of a stroker LS3, compstar crank and rods with wiseco pistons. During rebuild I changed from a -2 piston to a -15 dish. Machine shop re-balanced and everything went back together great. Now that is back together I have a vibration at a very specific 1800 RPM. car has 500 miles on it now and runs like a champion but that engine vibration bugs me.

Stock balancer
Circle D converter/TH400

I really want to blame either the converter or flex plate but stock balancer makes me want an innovations west balancer. I would love some input, I am trying to avoid the inevitable, that the machine shop messed up the balance.
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Old 03-14-2019, 09:34 AM
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Location: Poplarville, MS
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Unbolt the torque converter push it back from the flex plate, run the up engine and see if the vibration is still there.
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