It's still just typical BS about another brand and using misinformation to make a point. The 6.0 had a "knock" that GM recognized as an issue but a non-issue since it did not cause any damage. This was in the early 6.0L engines and the engine in my denali is one of those. Basically, best I can tell, is that there is an extended break-in issue because it is only noticeable if there is bad carbon buildup at the throttle body with the A/C on and it drops the RPM to 500 or just below if you have over 50K miles on the engine. You might here the slap then. But up to at least 20K the slap is noticeable.
To my knowledge no H2s experienced this problem. And this is not something that develops, it is something that is there from when you drive it off the lot due to the tight tolerances between the top of the piston and the bottom of the head. So, the slap issue is a non-issue where H2s are concerned IMO.
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