anyone know if the l76 in the trucks has an iron block or aluminum block?

 

Most truck l76's(ly6) are iron however some of them are alum IIRC

 

The L76 is aluminum, the LY6 is iron

 

As has already been said, when referring to truck motors the 6.0L LY6 is an “Iron Block / Aluminum Heads”, L76 “Aluminum Block / Aluminum Heads” & 6.2L L92 or L9H “both of which have Aluminum Block / Aluminum Heads”. The L9H is similar to the L92 but equipped for E85 flex-fuel use.

 

The Vortec 6.0L V-8 VVT ( L76 ) is a cast aluminum block V-8 with GM’s industry leading Active Fuel Management (A.F.M.) technology. The 6.0L also features industry first cam-in-block variable valve timing. For 2009, the Vortec 6.0L V-8 VVT (L76), is found in the Chevrolet Avalanche, Silverado and Suburban, and the GMC Sierra and Yukon XL models.


The new Vortec 6.0L is offered with either a conventional cast-iron (LY6) or an aluminum engine block (L76), giving customers a choice and allowing technology appropriate to the application. The lighter aluminum block allows vehicle engineers more latitude in tailoring weight distribution, and can mean a slight improvement in fuel economy. The Gen IV aluminum block is cast from A356-T6 alloy. With cast-in iron cylinder liners, It weighs roughly 100 lbs. less than a comparable cast-iron engine block.


Variable Valve Timing
The Gen IV Vortec 6.0Ls bring GM Powertrain’s industry exclusive cam-in-block variable valve timing (VVT), or cam phasing, to the small block V-8.

The Vortec 6.0L’s dual-equal cam phaser adjusts camshaft timing at the same rate for both intake and exhaust valves. A vane-type phaser is installed on the cam sprocket to turn the camshaft relative to the sprocket, thereby adjusting the timing of both intake and exhaust valve operation

 

thanks, just what i needed.

 

Now that you've got that out of the way, what ya got up your sleeve?

 

looking ahead a little.

i am considering doing a 350z with a twin turbo ls1 set up. i want to do what i can to keep the weight down so i am looking into a aluminum block engine.

the truck l76's are not as expensive as the car l76's. i am pushing the l76 in my g8 pretty hard and it seems happy.

cheapest would probably be an aluminum 5.3 any idea what they call that engine?

 

L33 is the alum. 5.3