Grilled Pizza! Alright, after some grill stone experimentation, I have finally hit my stride....sorta. For certain, no direct heat can be applied to the stone. Unfortunately, the amount of indirect heat I can generate with an 18 inch square stone under the hood is limited. I maxed out around 450, even with the smoker burner running on full. Nonetheless, the pizza and calzone turned out great, if not a little on the less than crispy side.