This is Not an Original Equipment Manufacturer (OEM) Part.
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3847640-A Volvo/OMC Exhaust Manifold - 51500
Exhaust Manifold for 454 7.4 Liter Volvo 1992 and... Read More
3847640-A Volvo/OMC Exhaust Manifold - 51500
Exhaust Manifold for 454 7.4 Liter Volvo 1992 and later applications with 1 piece exhaust riser.
Replaces Volvo Penta and OMC original equipment part # 3861459
OLD STYLE: Previously there was a large cooling rod attached to the bottom of the manifold which allowed a seawater hookup that would then pass through the manifold and then through the riser - out the exhaust. It effectively cooled the component with seawater but it didn't allow for a freshwater cooling system to be used to cool the manifolds with glycol. NEW STYLE: The new design still allows the hookup to the front or back of the manifold but also allows you to cool the manifold with glycol by entering the lower part of the manifold (see picture with red arrow) and exiting the manifold at the top ( see picture with blue arrow) to assure a continuous flow of glycol through the manifold and proper cooling of this exhaust component.
This manifold can be cooled with glycol (fresh water cooled) to better protect your engine and manifolds from seawater corrosion. Read Less
