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Old 09-12-2017, 04:20 PM   #9
20' Daredevil (Ret)
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Join Date: May 2003
Location: Jefferson State
Posts: 10,728
Re: Any idea on what this knocking is 72 C20 350

Have you tried to pin it down with a mechanic's stethoscope? Works better than a hose imho.

It doesn't sound to me like a cracked flexplate but I guess that's a possibility.... or loose flexplate bolts. As other have said, it sounds more like valvetrain to me.
- Mike -

1972 K20 LWB 350/350/205

RIP El Jay
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