By using March Performance 1657 Ford V-belt pulley kit, you can gain approximately 12-15 hp or increase cooling in your engine. These kits are available with Performance series or high water flow-style pulleys. Performance series pulley kits reduce accessory drag, which typically creates 12.5-15 hp at the rear wheels. They are made from CNC-machined 6061-T6 aluminum and finished with a clear powdercoat. These kits are designed for normal street driving. High water flow ratio pulleys improve cooling by increasing water flow and fan speed. This helps at critical low-speed driving, where most overheating occurs.