Found this info on GMinsidernews
Link, towards the bottom

The L92 looks like a sweet engine, all aluminum, LS7 design heads, forged crank, VVT, and it also gets the new 6-speed auto hooked to it.

 

2007 truck engines.....
6.0L aluminum block (L76) with Displacement On Demand technology and variable valve timing, rated at 355 horsepower (264 kw)*
6.2L aluminum block (L92) with variable valve timing, capable of 380 to 400 horsepower (283 to 298 kw)*

6.0L (L76) and 6.2L (L92) Gen IV Vortec engines use aluminum cylinder blocks, which offer reduced mass – an attribute that supports improved vehicle weight distribution and slightly improved fuel economy. The aluminum blocks are virtually identical to their iron counterparts, including a deep skirt design that incorporates cross-bolted main bearing caps and a structural oil pan. All engines, except the 6.2L L92, use a proven iron crankshaft design and highly durable reciprocating components. The high-performance 6.2L L92 uses a forged steel crankshaft.

The block for the 6.2L engine features a crankcase “windows” – vents that help improve bay-to-bay breathing. This reduces pumping losses and supports the high horsepower output of the high-performance engine. A new, 58X ignition system and a more powerful, E38 ECM are integrated on all engines

High-flow cylinder heads ...
The Vortec 6.0L and 6.2L engines offer a significant power level increase compared with previous premium engines, with much of the newfound power coming from high-flow aluminum cylinder heads. The heads are based on the racing-derived cylinder heads of the Corvette Z06’s LS7 7.0L engine, including a unique inlet port shape and offset rocker arm design. Airflow of the heads is supported by large 55-mm-diameter intake valves and 40.4-mm-diamter exhaust valves.

“The heads use the high-performance technology of the Corvette’s LS7 to build efficient power in truck engines,” said Meagher.

Vortec 4.8L and 5.3L engines also have high-flow, Corvette-derived heads. They are based on the previous-generation Corvette Z06’s LS6 engine’s cylinder heads and have flow characteristics commensurate with the engines’ airflow-to-displacement needs. All the Gen IV Vortec engine variants use the same efficient ignition coil packs of the LS2 to light off the air/fuel mixtures that are drawn through the heads.

The main things everyone needs to know about the L92 engine...
6.2L
Aluminum block and heads
LS7 design heads with the offset rockers
Variable Valve Timing
Forged stock crank
Coupled to the new 6-speed automatic tranny

L92 combustion chamber
http://gm.wieck.com/forms/gm/previewpage?026549 valves
http://gm.wieck.com/forms/gm/previewpage?026546 valveless

LS7 combustion chamber
http://gm.wieck.com/forms/gm/previewpage?022797 valves
http://gm.wieck.com/forms/gm/previewpage?024297 valveless


L92 Intake ports
http://gm.wieck.com/forms/gm/previewpage?026548 intake ports

LS7 Intake ports
http://gm.wieck.com/forms/gm/previewpage?022803 intake ports
http://gm.wieck.com/forms/gm/previewpage?022800 intake ports

LS7 Exhaust ports
http://gm.wieck.com/forms/gm/previewpage?022799 exhaust ports
http://gm.wieck.com/forms/gm/previewpage?022798 exhaust ports

Exactly, they do look to be unported LS7 heads..............

Cam phaser...
http://gm.wieck.com/forms/gm/previewpage?026547

6.2 Block pics...
http://gm.wieck.com/forms/gm/previewpage?026545
http://gm.wieck.com/forms/gm/previewpage?026551
http://gm.wieck.com/forms/gm/previewpage?026552
http://gm.wieck.com/forms/gm/previewpage?026557

 

These heads really do show alot of potential! The testing PRC has been doing on them seems to be very positive if we can get a intake that will allow us to run them on our cars

 

So are these the heads we can use on our LS1s, or is that still a ways off?

 

Will the ls7 intake work with these heads?

 

I was about to ask the same thing. If they are designed around the LS7, then maybe. The intake port might be too big for these heads though. Gotta love where GM is going with there engines.

 

I wonder how the variable cam timing works. At one point, I was told (in 03) that the C6 would have a dual cam in block design. This sounds like a single cam that varys intake and exhaust timing together.

But how?

P.S.
So the LS7 heads will, more or less, we the standard head going forward.

 

It's almost identical to the ls7 so yes, only the ls7 intake will work on these.

Nate

 

why not just use the ls7 intake it is very affordable. Much less than a fast 90

 

If thats the case I know which why Iam probably going with the heads and intake. Should be a pretty good match for a 408.

 

If this stuff fits LS1/2/6, it will render all current heads and intakes obsolete for uses that allow it (some racing classes require heads that came with the engine).

 

It does and will fit the ls1/2/6 stuff. You'll just have to have a bigger bore to accomodate a 2.2" intake valve (see 4.060+)

Nate

 

this thread is referring to the 07 truck heads which are ls7 design except they will fit small bores like our stock ls1 bores.

 

How did they get the extra .2 cubic inches, bore or stroke?

 

Well I don't know either way, but what I do know is that a 4.125 bore x 3.622 stroke is right at 6.2 liters. One can only hope!!!

 

The intakes will not bolt up at all. They are definately different shapes. Even the rocker spacing is different from the LS1 & LS7 heads.

The only way I see the 6.2l head fitting on a ls1 car is if we luck out & GM's truck intake fits under the fbody cowl.

 

i think your right about the 4.125 bore on the 6.2

it make sence since they dont use a bigger stroke on the 6.0 motors just a biger bore

i think that these blocks are going to be awsome and relitivly cheap

 

Does anyone know the combustion chamber volume for the L92 heads?

Andrew

 

The LS7 intake runner is .400" higher from the deck than the 6.2L, checked that 3-4 months ago. The rocker spacing holes are about the same, although the pedestal is built into the LS7 head while the 6.2L is flat milled like the LS1's have been.

 

69cc