SLP Heavy Duty LS1/LS6/LS2 Oil Pump (PN:55001) Fits LS1/LS2/LS6 Engines. These Oil pumps are ported on both the inlet and outlet sides. This helps keep oil temperatures down, increasing engine-component longevity and reducing power-robbing oil shear. Each pump is fully disassembled at SLP's facility, after which its individual components are inspected and cleaned in a heated, dual-frequency ultrasonic cleaner. Finally, SLP's expert technicians pre-lube all critical assembly points with a leak-resistant moly lubricant and reassemble the pieces to GM blueprint specs. The completed pumps feature a corrosion-resistant coating and bear a unique serial number corresponding to their batch, build date, and assembly tech. No other LS1/LS2 oil pump offers this combination of features-at any price! STRONGLY RECOMMENDED FOR ANY HEADS/CAM or HIGH HP ENGINES