A pouring conveyor (11) in the form of a continuous loop receives sand molds (M, M') on pallets (12) or other mold carriers and conveys the empty molds to a pouring station (80) wherein molten material is deposited therein to form castings. Each mold (M, M') is provided with a supportive weight and jacket (14) before pouring. Thereafter, the molds (M, M') with the weight and jacket (14) surrounding them, pass through a primary cooling line, at the end of which molds and weight and jacket are separated in a jacket transfer station. The weighted jacket is removed and transferred to an on-coming freshly made mold while the castings pass through a secondary cooling zone for further cooling and subsequently discharged said conveyor (11). The process allows for a substantially smaller number of weight jacket combinations and floor space than previously known molding processes.