Aluminum H/V Water Pump - Olds 350-400

The Aluminum H/V Water Pump for Olds 350-400 is a high-volume mechanical water pump engineered for Oldsmobile V8 engines requiring improved cooling circulation. Built for classic and performance applications where stock cooling capacity falls short, this pump delivers the flow rate necessary to maintain optimal engine temperatures during sustained driving or modified engine configurations. Restoration shops, hot rodders, and enthusiasts restoring original Oldsmobile V8 powerplants rely on this upgrade to prevent overheating and extend engine life.

Constructed from aluminum for weight savings and corrosion resistance, this MILODON unit features a high-volume impeller design that increases coolant flow compared to factory pumps. The mechanical drive design integrates a 5/8-inch pilot and 1-7/8-inch inlet, allowing direct bolt-on installation to compatible block configurations without complex adapter requirements. Aluminum construction reduces underhood mass while maintaining the durability needed for continuous circulation duty, making it ideal for both street and track applications where thermal management is critical.

This water pump is the ideal choice for anyone rebuilding or upgrading Oldsmobile 350 or 400 cubic-inch V8 engines, particularly in applications with performance modifications, aluminum radiators, or non-original cooling system configurations. Compatibility is direct for engines using the specified pilot and inlet dimensions; verification against your specific engine bay layout and accessory drive setup is recommended before purchase. The compact footprint—8.5 by 8.1 by 10.7 inches—and lightweight construction (6.35 pounds) make installation straightforward for experienced mechanics and first-time restorers alike.