Hey guys, thought I would give an update. Turns out I didn't break the 400. I blew the plug(bolt) out of the factory dipstick hole. My best guess, the sound on the video was the tire slinging the bolt into the wheel well. Made a new plug, sealed it up and it is running great. The motorhome 440 is now just getting cleaned up, small rv cam I have laying around, and up for sale. I am going for my 440 build. I will be posting some details in a new post and looking for recommendations.