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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2005 Posts: 12 Junior Member | | Junior Member Joined: Mar 2005 Posts: 12 | Hareboy
Sounds like it could be rod bearing(s). They don't knock at an idle or under a load, but if you rev the engine, you will hear them (rattle). Better be pulling the pan and checking them with plastigage.
Good luck.
Doug
Doug
54 Chevy 3100
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