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For stock, I'm guessing near 4" but I'd go & buy a low profile on if I were you. Check out Sears Craftsmans ALuminum jack....red, lightweight, & bad @ ss! :thumbs:
I just picked up a low profile racing jack from Harbour Frieght for $99. It fits perfect under the Z and mine is lowered...and you get a choice of colors!!! :D
I think the lift height is a little less than 4 inches in the rear and that's not using a "lifting puck" as specified in the owners manual. I had a sears jack that was 4.2" high in the front but it would not fit under the rear liftings points. You will need something probably closer to 3.4" high in order to get a lifting puck on there and still lift the rear. Lower is always better though when it comes to lifting the Vette. Here is some info. from the forum: https://www.corvetteforum.com/review...548&TopicID=19