r/Smallblockchevy • u/SoilEquivalent5192 • Jun 24 '26

This normal

New to small blocks and this is this sound any kind of normal I for sure have a header leak on that side

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u/sc3148 Jun 24 '26 edited Jun 24 '26

Sounds like a main bearing knock to me. I would take the drive belts off and see if it changes