Sierra 18-1986-2 Exhaust Manifold Set OMC Volvo Penta V8 305-350

The Sierra 18-1986-2 is a marine exhaust manifold designed for OMC and Volvo Penta V8 marine gas engines. This heavy-duty cast iron manifold is engineered as a direct replacement for OEM parts 3852374 and 3857723, providing reliable exhaust routing in harsh marine environments.

Key Features:

• Fits GM/Chevrolet small block V8 engines (305 and 350 cubic inch displacement)
• Compatible with 1989-1998 OMC and 1994-2006 Volvo Penta V8 marine engines
• Center-rise manifold design with 4-inch riser outlet
• Interchangeable between port and starboard sides
• Heavy-duty cast iron construction for durability in marine environments
• Designed to meet or exceed OEM specifications

This aftermarket replacement exhaust manifold is engineered for GM/Chevrolet small block V8 engines (305-350 cubic inch displacement) commonly found in marine applications. The manifold features a center-rise design and accepts all factory original accessories and mounting brackets. Gaskets and mounting hardware are sold separately.

OEM Cross Reference: Replaces OMC/Volvo Penta part numbers 3852374 and 3857723.