I remember some writings about the VE and formula that is used to calculate it. The article I read involved the SHO engine. VE is over 100% at two rpm points in the engine. They also coincide with the two torque peaks 2900 and 4900 rpms with the 2900 having a higher VE in the stock engines. The VE is over 100% because of the pressure waves in the intake mainfold traveling between the tanks and intake runners. At the torque peak the pressure wave help pressurize the air going into the engine for a slight supercharged effect allowing the engine to exceed 100%VE. Some of the new designed variable length intake mainfolds allow this effect over a greater rpm range. The two stage in the SHO gives two rpm peaks.