In 2014 they still made the old GMT900 truck under the "Classic" badge as the new K2xx had just come out with the L83. That is probably the difference you guys are seeing.
I have had a couple leases with that engine and thought they were great - I think it is the first year DI engine for the trucks. I did look at shortblocks and they are readily available from junkyards, but they are on backorder at the dealerships. So I am not sure if that is a good or bad sign. I found a 2WD 6.2 2015 at a dealer locally, but the thing was rear ended and poorly repaired. The wheelhouse liner was too short for the wheel opening and the tailgate didn't lower without a push. Honestly, that one is still on the short list though.
-Geoff
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