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I have a 1978 c3 with the l48 factory 350 and recently after start and the motor is warm I hear a wear knocking noise and have no idea where it is coming from. I’m uploading a video as well to get help and hopefully someone can help me figure this issue out
 

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I have a 1978 c3 with the l48 factory 350 and recently after start and the motor is warm I hear a wear knocking noise and have no idea where it is coming from. I’m uploading a video as well to get help and hopefully someone can help me figure this issue out
No video posted (not that I'd be of much help anyway...)
 

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Is it persistent, or does it eventually settle out after a drive? Have you pinpointed the location in the engine?
Here's a video I found where someone shows how they pinpointed a knocking noise, and where they found they issue.


Good luck.
 

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DC PIT CREW BOSS
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Does it sound like a rod knocking as in spun bearing that is worn out?
 
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