Edelbrock #8896 Victor Series Water Pump for GM Gen III LS1 and Gen IV LS engines is a two piece insert style pump. This aluminum reverse rotation water pump is ideal to prevent overheating in street rods and street machines, as well as in tow rigs. Using state-of-the-art racing technology, Edelbrock has designed these "super cooling" Water Pumps to provide maximum flow, maximum pressure and equal distribution to both sides of the block within 1%. Available for most popular applications, these high performance pumps flow in only one direction for optimum efficiency. The casting's computer-designed internal passages and precision powdered metal impeller produce the maximum flow rate possible. This pump requires the use of an aftermarket pulley, like Edelbrock's part #8898 billet pulley.