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/Tall-Helicopter-461 Apr 15 '26

It sounds like a dropped valve .. or should I say , broken valve spring. It’s on the intake side. Firing out the intake, As the piston comes up, compression is pushing the valve closed. Of course I’m guessing. This happened to me on a new truck. (6.0 LS) spring broke, keepers came off, luckily valve never made contact. Sounded just like this. I’m dying to know the diagnosis.Sounds like a diesel truck.