My 2019 Ram with the 5.7 hemi about (37,000miles) will knock on a cold start, only once the engine has idled down and starts to build temperature. If I rev the truck the knocking will speed up and get louder. But once at operating temperature the noise seems to quiet down to a settle tapping(almost not noticeable). I’ve already had the truck into the dealer they did both side manifolds and bolts but the noise is still there. Now I’m being told that’s normal noise. I doubt it’s normal, I’ve done some research and found a couple people with similar symptoms had engines replaced and the cause was the failing hydraulic lifters. They mentioned that the dealer inspected the OCV and found metal shavings and that was the reason for a whole a engine. Has anyone else experienced this, I will try to attach a video of the knocking.