He has a 2011, his 5.3 probably already has 243/799s and flat top pistons.
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now what 6.0 heads you thinking? L92 or the 243 since you have a gen IV?
317s on a 5.3 net you 8.4 cr extremely low,
your better off with 9.0-9.5 for most builds
The 317's are the only ones I have looked at so far. I would be interested to know what you would suggest though.
Leave your heads you have now.
Both my 53s have 243s on them. One came with them from factory
Thanks Quik