I disagree. A valve tap is more of a consistent rhythm and has more of a tin can tapping sound. This sound from the video is more of the typical exhaust leak sound some call it sounding like a steam train. The "clicking" sound in the video is not a consistent rhythm. It skips and misses which valve taps do not. It's almost like listening to a Harley Davidson motorcycle exhaust at idle.
I hear the intermittent tap among a lot of valve train noise.
If the sound skips and misses that doesn't coincide
with an exhaust leak. That would be rhythmic also.
As I listen to it again it actually sounds like a plug
wire arcing to the block intermittently. I own a Harley
and if they are known for anything it is definitely
their rhythmic idle.
