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Old 08-09-2018, 04:21 PM   #2
MARKDTN
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Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,134
Re: 1970 Chevy pickup C20

I don't know about those 2 part numbers, but pretty much the difference is straight across bolt pattern and offset bolt pattern. Each one corresponds to a different size flexplate.
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