Help with engine questions
 

I know this is waaaaaaaaaaaaaaaaay off topic, but I know there are some regulars around here that can help me out with my question.

Why is there a pretty significant power difference between the:
Chevrolet HD 2500 with the 6.0L ~360hp
Suburban 2500 with the 6.0L ~330 hp

They are both mated to the same transmission, I am trying to figure out what the deal is. . . . .

Most likely, detuning. As the Suburban is more of a people hauller than a work type truck. The same can be said about the Tahoe and Yukon, why does the Yukon get more power out of the supposed same engine as the Tahoe? This is an interesting question, and one I don't fully understand the reasoning behind. But my best guess is detuning! Do you have engine codes, if the codes are different than that would explain a lot. As then there is obviuosly dfferent internals.

my truck has the dished pistons. the one with the flat pistons is higher compression and more hp, but doesnt work out so well with forced induction. theres a vortec 6.0 and a vortec max 6.0. i just have to deal with less hp and use lower octane gas.

The LQ9 has a higher CR and heads modeled after LS6 heads. Not tottally certain of a cam difference. Later model LQ4's in 3/4tons have 345hp too now IIRC.

You are right, the 2009 sub is rated at 352 now:
THe HD truck statesInterestingly enough the 1/2 ton now offers an all aluminum block with 366hp

You can even get an L92 with 400hp now too in crew cab half tons and tahoes... just not reserved for the denali's/escalades anymore.

L92 is a 6.2L, based on the LS3, with the big intake valve heads, kinda like the L99 in the new auto camaros...

right... just stating that its gonna be replacing the 6.0l vortec max option on 09+ ltz trucks. Prob muddy'ed the water with this.