Direct replacement for 1966-69 cast iron pumps. Probably the last water pump you'll ever buy. Built to cool better and last longer than any other pump. Features state of the art high efficiency impellar and NASCAR roller type bearing. Race proven for reliability and performance. FlowKooler hi flow water pumps resolve low-speed heating problems by doubling flow rates at low rpm and idle. CNC precision machined impellers feature larger diameters, increased vane count, tighter clearances, shrouding and porting. These unique design features help drop engine temperatures up to 30 degrees, increase the block pressure to prevent hot spots on cylinder walls and stop the formation of steam pockets in the block all while delaying the onset of cavitation at higher rpm. Impellers are protected from electrolysis and corrosion with a Type II Class II Military Grade anodized surface coating. 2 year warranty. From 0-3,000 rpms?Nothing Beats a FlowKooler!