High Quality Reproduction Water Pump Pulley Deep Single Groove Stamped Steel Correct Stamping Replaces GM 3947824 Keeping your 1969 Nova's engine pulleys in good working order is critical. Pulleys keep engine belts properly aligned and in good shape is essential for your engine. This stamped steel water pump pulley is manufactured according to original specifications for stock applications. Designed for 369ci Chevy big blocks, this pulley is as close to original as they come. Don't take a chance on a rusty water pump pulley destroying your belt and leaving you and your 1969 Nova stranded.