Allstar 1: 1 Ratio Double Groove Aluminum Pulley Kit for Small Block Chevy Short Water Pump and Head Mounted Power Steering Pump has a pulley kit which is a 1: 1 ratio, double groove design for small block Chevy short water pumps. It has a block mounted power steering pump. The pulley kit includes belts. The water pump pulley has a 5/8 inch diameter hole. The replacement components are also available separately. It is backed by a 90-day limited factory and sold as one complete kit.