Airtex PM454 High Performance Marine Mechanical Fuel Pump for 1965-90 Chevrolet Big Block 396, 402, 454 and 502 8 Cylinder Precision-cast units designed to meet or exceed OEM specifications Special heat treated rocker arms and case-hardened pins to ensure long-lasting performance Upgraded seals and pump diaphragms for compatibility with modern multi-fuel blends 100 percent tested throughout the entire manufacturing process for worry free, out-of-the-box performance Limited 1 Year Warranty