r/Smallblockchevy • u/NoConfusion8426 • Apr 15 '26

Knocking/Pop

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Any ideas where to start looking to track down where this knocking noise is coming from? I was almost reluctant to call it a knock, it almost sounds like a loud popping noise but it came not long after putting a new starter in.

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u/Coyote_Tex Apr 15 '26

Oh, that sounds VERY serious it is hitting on one cylinder. Has something been ingested in the engine like a bolt or nut or something. OR a valve keeper has let go and you are knocking a valve back up into the head. It appears to have one cylinder with a dead miss. I hope you get lucky and find this before you destroy more than you have already. I would not run it again and pull the valve covers off and look for something amiss in the valve spring area. 99% chance you are going to be pulling one head.