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Dear Metallo,
I've done a sound waveform analysis of those ticking noises from your video on my laptop comparing to valve ticking sounds I got from some youtube videos. What I get is that they have similar waveforms. So you might be right in thinking those are valve noises.
Exhaust leak noise usually becomes louder during acceleration and not loud during idle. Its could be that the microphone that captured your sound amplified it a bit in that it sounded like "chug-chug" to me thus made me say its like a "motor boat" sound.
So yes, check your valve clearances. Did you organize the valve buckets with their respective shims according to their original placing in the head and replace them back into their respective places as before? Because the buckets could have different wear at their valve stem contact points (have a look inside the buckets) and if you got them mixed up during reinstallation you might get increased valve clearances thus producing the noises.
If this happened you need to readjust the clearances. Don't bother doing this on a hot engine, its unpleasant to work with. Suffice to read clearances on cold engine, replace the shims with thinner or thicker ones bearing in mind the clearances will increase 0.05mm when hot (eg. 0.40mm clearance will be 0.45mm when hot). Aim for all having 0.40mm clearances (cold) if you can with the available shims by switching them around. Otherwise you need to order one or two shims with new thickness.
Amarin
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