I have an update on the LS3. After the longs two years of research for what I need to put this new LS3 in my truck I found out last night that I could build a LS3 engine in my shop for 10K to 12K cheaper. $5K or less.
I finally realized why they borrowed the heads from a L92. That is not the only thing they borrowed. The block as well. Turns out they made the 6.2L for the Denali's, Escalade's and LTZ model trucks in 2007.
Now the LS3 borrowed the rest of its parts from the L76 6.0L corvette "car" engine. It replaced the L92 tall intake with the L76 shorter one. Then replace the lower oil pump and oil pan with the L76.
Now the mods to the engine was they removed the VVT cam and replaced it with a regular one and changed the cam cover. then changed the valve springs, push rods and rocker arms.
The result of changing the intake was the taller one produced more torque than HP, the shorter one created more HP than torque. That and you can close the hood. With the intake being cathedral and the heads rectangular there was no need to change the design of the intake. The rectangle heads produce more flow at 68cfm verses the 63cfm the cathedral style produced. Now aftermarket intakes have them matched with the L92 heads creating 70cfm. Changing the cam, rods, valve springs and rocker arms to a lighter ones helped create more HP. Changing the oil pump and oil pan was needed to clear the chassis and keep it from hitting the oil pan on the ground.
Now you have a car version of the L92 with more performance to make it stand out a little in the Chevrolet SS Concept car (Holden VF Commodore copy to replace the Pontiac G8 after Pontiac was discontinued) , Corvette, Pontiac G8, and Camaro SS.
So to the cheap build. Since I am going with the L92 and build a custom L92/LS3 for my truck I am keeping the intake to the L92. The L92 engine I can get in a junkyard for $2500 to $3500 depending on mileage. Change the cam. polish and port the heads. add 72 lbhr injectors and a 92 or 102 mm TB.
Now that was just the engine. The truck will need to have a few upgrades for this swap. I need electric fans. Those will be added soon.
Any thoughts?