96 Bravada

Alright I am doing some research for a buddy. I have a question about his bravada. He has put a lowering block on the rear and then lowered the front with the tensioners. Now he wants to put 20's on it. I myslef have a 96 blazer and didnt think it was possible. Does anyone know what the biggest he can throw on the bravada is. He is planning on putting the lowest profile tire on there. Any help would be great thanks.

i have no answer on the wheels, but do have question.

what's your buddy gonna do next? chop the top off and drop it six inches? you've got enough headroom to do it, might look cool.