I have good news, its not a rod knock it sounds like you either have a broken valve spring or a a cam that has gone flat, start on the side that the noise is coming from and remove the valve cover, then grasp each rocker and try to move it to check for looseness. Some will be tight because they or in the cam lobe cycle. Turn the engine over by hand 90 degrees and check the others, then turn it 90 degrees again and check the rest.
Love the video BTW. Really helps, if you can rev the engine it see if the noise goes away which is another sign of valve train issues.
Friday, October 21st, 2016 AT 4:23 PM