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Old 11-08-2016, 01:13 AM   #1
JMD
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Join Date: Jun 2013
Location: Grand Rapids Michigan
Posts: 291
Externally balanced engine troubles

Hi all,
Started my rebuilt 454 (Originally out of a '78 chevy pickup) for the first time today and found that it has a fairly violent shake that increases with engine speed. The only thing I can think of is that the PO put an internally balanced fex plate and harmonic balancer when they should be externally balanced pieces.So my questions are...
1. How can I tell for sure whether or not my flexplate/balancer are externally balanced?
2. Can I just buy an exterally balanced harmonic balancer/flex plate and install them? Or will I need to get the whole rotating assembly balanced as well?
Thanks in advance for amy help
-Jordan
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