Alright I have a quick question. So I took my wagon out today and heard a knock so I suck my head under the hood. It sounded like it was coming from #1 so I pulled the plug wire and the noise got a lot louder. So layed under the car and put my ear on the oil pan and the noise was gone. I'm thinking it is valve train but would like a second opinion. Also the compression on #1 is down 40psi I would like to know if the two could be related. It also has a 383 if that matters. Thank you for all the help.