Abstract: A box form used in a dry cast system for making a concrete box culvert. The form has a pair of wall sections secured together with a pair of corner units. The corner units can be removed from the wall sections and replaced with different sized corner units to change the size of the complete form. Spacers can be interposed between the corner units and wall sections to change the wall thickness of the box culvert. The form is carried on a pallet assembly having members for accommodating lift structures of a fork life vehicle. The pallet assembly is a rectangular structure having a stepped pallet and upright guide members. The guide members cooperate with rails on lower portions of the form to locate the form on the pallet assembly. The pallet assembly and form surround a box core providing a box chamber for receiving the concrete mix forming a concrete box culvert.