It's 6.0L so it's bored, stroked, and it has a more efficient 32-valve layout with dual OHC. There's also a 6.0 SOHC version with std 16 valves, there are AMG cams, AMG heads, AMG headers etc; all of these are VERY hard to find and cost MUCH $$$ to the point where it's cheaper to find the specs and have someone fab new for you - or cheaper to pop in a different engine like a "E500E" m119.