[BigAls87Z28]

All the Gen IV engines have AFM designed in them. The LS2 is the only engine that did not get it because Team Vette dont play that ****.
All other Gen IV's have AFM as seen in the new GMT-900 SUV's and Pick Ups. They are also designed with Variable Valve Timing, another big addition that we will see with the LS3.
The 6.2 is a hybrid motor. Its Gen IV Version 2.0 you could say. The advancements from the LS1 to LS6 netted the LS2. The Advancements from the LS2 to the LS7, nets us the L92/LS3 engine. The L92 heads are similar in design to the LS7's, minus the sodium filled valves, CNC porting, etc, but the intake port design and semi-big block style valves along with the flow capacity is about there. GM has recently started selling the L92 castings assembled for pretty cheap. The L92 in the GMT-900's has VVT and AFM, and makes 403hp in the Caddy Escalade and the GMC Denali's. And thats a truck motor. Imagine if someone with performance came in and played with it...well....you get the LS3.
Additional info. the 6.2 was the original displacement for the LS7. Team Vette was aiming for 500hp, but couldnt quite reach it, somewhere in the 480ish range. Then then moved displacement to 7.0, and they blew past that number and into the 500's, and still keeping it 26mpg highway.