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No, its stock ZR1.
I'm pretty sure the measurement is 86mm
Im not 100% sure, but I think its that same as a stock LS3 throttle body.
Someone please correct me, if I'm wrong.
Actually it's not the same as the LS3 throttle body. It's slightly smaller at 87mm but was used on the ZR1 do to it's smaller packaged motor. Also it was chosen for it's stronger return spring. They are the same as used on certain GM trucks.