Water pump short Chevrolet Small Block Rib Water pump for Chevrolet Small block. The water pump has a larger impeller with almost straight blades, which flows up to 40% more than the original. In addition, the water pump has an extra strong ball bearing. Material: Aluminium Design: Satin in striped design Flow: High volume Height: 14.5cm (Short) To find out if you have a long or short water pump, measure from the engine block out to the installation surface for the pulley on the water pump.