Sierra 18-3599-2 Bi-Directional Circulating Water Pump for GM V6 and Small Block V8

The Sierra 18-3599-2 is a high-quality aftermarket circulating water pump designed specifically for GM V-6 and small block V-8 marine engines. This bi-directional pump can be installed on both right-hand and left-hand rotating engines, making it a versatile replacement solution for multiple marine applications.

Key Features:

• Engineered for GM V-6 and small block V-8 marine engines
• Bi-directional design works with both right and left hand rotating engines
• Features corrosion-resistant brass impeller for long-lasting durability
• Assembled using new castings with powdercoat finish to withstand harsh marine environments
• Includes mounting gaskets, brass plugs and fittings, stainless steel seal cup and spring
• Meets or exceeds OEM specifications for reliable performance

This pump replaces multiple OEM part numbers including MerCruiser 850399, 8503991, 46-8M0113734, 811841, Volvo Penta 3853850, 835390, OMC 980477, 3853850, Crusader 20318, 7142520, and Pleasurecraft RA057018. Note: This pump does not replace the engine water circulating pump used on 2007 and newer V6 4.3L engines without water bypass hole.