Water Pump GM Marine Small Block 4.3L 5.0L 5.7L # 18-3506, 18-3583, 18-3599

Water Pump for GM Marine Small Block

This marine water pump is a direct replacement for small block GM engines with 4.3L, 5.0L, or 5.7L displacements, cross-referencing OEM numbers 18-3506, 18-3583, and 18-3599.

Overview

This water pump is designed for marine applications on GM small block engines ranging from 4.3L to 5.7L. It circulates coolant to maintain engine temperature in freshwater or saltwater environments, replacing worn factory pumps. The included OEM cross-reference numbers ensure proper fit for common GM marine configurations.

Built For Performance

• Designed for GM small block marine engines (4.3L, 5.0L, 5.7L)
• Constructed from corrosion-resistant materials for marine use
• Direct replacement for OEM pumps with part numbers 18-3506, 18-3583, 18-3599
• Includes gasket for easy installation
• Reliable coolant flow for engine cooling in demanding conditions

On-The-Job Use

• Replacing worn water pumps on GM-powered boats
• Restoring cooling system performance in small block marine engines
• Ideal for freshwater or saltwater recreational and commercial vessels
• Commonly used in ski boats, fishing boats, and cruisers with GM 4.3L-5.7L engines

Specs At A Glance

Good To Know

Q: Will this water pump fit a 1990 Mercruiser 5.7L engine? A: This pump is designed for GM small block marine engines; check your specific engine model and OEM cross-reference numbers to confirm fitment.

Q: Does this pump include a gasket? A: Yes, the pump comes with the necessary gasket for a proper seal during installation.

Slight variation in finish or dimensions may occur between production runs, and confirm compatibility before ordering.