Even if it doesn't close all the way, I highly doubt you will need it closed anyways if you are going to muck with it much.
I am thinking about using a standard throttle body and controlling the VVEL stepping motor in relation to RPM/throttle. It's going in a supercar, so, I don't really worry about the pumping loss from the throttle body.
I can't image needing the valves closed all the way, all the time, unless you wanted to do cylinder deactivation on one bank, but on a cross-planed V8, it would make for some very uneven firing.
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