foxsl

iTrader: (1)

I recently picked up a square port truck intake but I am unsure if the 6.0 square port and 6.2 square port TRUCK intakes are the same internally. The seller referred to this truck intake as an "L76" intake.

I looked on Rockauto and am finding 3 different part numbers.
07-08 6.2 truck intake part number ends in 678
09+ 6.2 truck intake ends in 600
and a 6.0 truck intake that ends in 038 and is listed in the 2010 model year under "6.0 electric/gas"

The 038 truck intake is listed as having a width of 12.93" and height of 21.63" while both the 600 and 678 have a width of 12.97" and height of 21.85".
The

Please let me know any details, so far my square port truck intake has runner dimensions of 31.5 mm x 65 mm.

G Atsma

Electric/gas is the hybrid which likely has some weird stuff to handle that. The other two are likely very similar, just one replaced the other due to some refinement for that model year. Either one can be used for what you want. They interchange. LS engines are mostly dimensionally identical.
BTW, most 6.0 truck engines used cathedral port heads. I think the hybrid one is also.

foxsl

iTrader: (1)

That makes sense and it looks to be the same scenario as with the tbss and nnbs intakes where different part numbers of newer intakes were related to the pcv fitting on the very top.

In cathedral world, the 07.5+ older nnbs truck intakes used a permanent 3/8"-ish fitting while the 09 or 2010+ cathedral truck intakes used the removable pcv fitting at the top (to work with a 1 piece hose).
My square port intake uses the permanent pcv fitting at the top so I guess it's the 07-08 style.