There is a loud slapping noise from bottom half of the motor?

1988 CHEVROLET SILVERADO
248,401 MILES
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5304072702
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No vibration like bad bearings, unhooked serpentine belt to eliminate outside possibilities.
May 29, 2023 at 10:32 AM
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STRAILER
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Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response.

This guide may help:

https://www.2carpros.com/articles/engine-noises

Please go over this guide and get back to us.
May 30, 2023 at 12:15 PM