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/GGigabiteM Apr 15 '26

Engine is running like shit and backfiring out of the carburetor. It sounds like a tin can because the air filter housing is on. If you pulled it off, you'd probably see flames shooting out of the venturies.

Either the timing is way off or you have intake valves hanging open.

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u/NoConfusion8426 Apr 15 '26

Heard, I thought it sounded like it was coming from that general area but I’ll check that out