COMPLETE FLATHEAD PUMP KIT â Includes both driver- and passenger-side water pumps plus gaskets, simplifying cooling system upgrades on 1937â48 Ford and Mercury Flathead engines., HIGH-FLOW DESIGN â Features modular impellers, close tolerances and updated internal components that improve coolant flow and help reduce cavitation., DURABLE BEARING SYSTEM â Built with severe-duty roller and ball bearings for long-lasting operation and improved stability under demanding conditions., CERAMIC SEALS & STRONG SHAFT â Equipped with modern ceramic seals and a robust 5/8-inch shaft for enhanced strength and efficiency over original-style pumps., HEAVY-DUTY CASTINGS â Constructed from high-nickel iron with a premium black painted finish; designed for use with 5/8-inch belts and includes precisely machin.