Went out to start the car the other day and thought i heard a knock.It went away fast though and didnt come back,so i wasnt sure what i had heard.Tonight went out in the garage and fired it,and yup,there it was.Car was cold so it was idleing rough,and it seemed the lower the rpm got the louder it got.So i turned it off,came back to listen to it again,and poof,it was gone.No knock.It sounded like a pretty solid knock,not a tick.I should mention that during this whole thing it has 80 pounds of oil pressure,and nothing in the oil i can see.Any ideas?Motor has maybe 2 hours on it.416 smallblock,solid roller cam.Thanks
