27-73866 Exhaust Manifold Gasket Set for Ford 302 & 351 V8 Marine

SERDAMARINE / MARINE EXHAUST PARTS

Exhaust Manifold Gasket Set (2 Pieces) for Ford 302 & 351 CID V8 Marine Applications

This two-piece replacement exhaust manifold gasket set services the exhaust manifold joint on specified MerCruiser, Volvo Penta, and OMC marine engines built on Ford 302 CID (5.0 L) and 351 CID (5.8 L) V8 blocks, referencing OEM part number 27-73866. It applies to listed MerCruiser 215–255 and 888 models, Volvo Penta 5.0/5.8 L and Fi/FSi applications from 1993 onward, and OMC 5.0, 5.8, and 351 EFI applications from 1991 onward.

This product is a gasket set only and does not include an exhaust manifold assembly.

Engine Applications

Engine displacement (5.0 L or 5.8 L) alone is not sufficient to identify the correct exhaust manifold gasket. Verify that your engine matches the Ford 302 or 351 CID V8 block configuration, full model designation (including MIE, Fi/FSi, or 351 EFI where applicable), and the open-ended year ranges listed below.

• MerCruiser 215, 225, 225MIE, 888 — Ford 302 CID V8 (5.0 L) exhaust manifold applications. Fits when specified: Confirm Ford 302 CID V8 block and exact model designation
• MerCruiser 233, 233MIE, 255, 255MIE — Ford 351 CID V8 (5.8 L) exhaust manifold applications. Fits when specified: Confirm Ford 351 CID V8 block and exact model designation
• Volvo Penta 5.0 L / 5.8 L & Fi / FSi — Ford 302 / 351 CID V8 applications; Years: 1993 onward. Fits when specified: Confirm Ford 302/351 CID V8 block, 1993-onward production, and full Fi/FSi designation
• OMC 5.0, 5.8 & 351 EFI — Ford 302 / 351 CID V8 exhaust manifold applications; Years: 1991 onward. Fits when specified: Confirm Ford 302/351 CID V8 block, 1991-onward production, and exact 5.0, 5.8, or 351 EFI model designation

Reference Numbers

The numbers below are provided for part identification and cross-reference only; they do not by themselves guarantee interchangeability across every engine variation or indicate original manufacturer identity. Keep complete part numbers, including leading zeros and suffixes, when matching your existing gasket.

Note on suffixes: Both Sierra 18-0183 and 18-0183-1 appear in references for this gasket profile, but do not assume they represent identical package or sub-version specifications without checking your exact part requirement.

Supplied Parts

• Exhaust manifold gasket — 2 pieces

Service & Installation Notes

General service guidance only. Use the service manual for your exact engine and exhaust configuration.

1. Ensure the engine is completely cool and disconnected from starting power before beginning exhaust manifold service.
2. Support heavy exhaust manifolds properly during removal and installation to prevent fastener damage or personal injury.
3. Clean and inspect the cylinder head and exhaust manifold mating surfaces thoroughly, removing old gasket material and corrosion while protecting the sealing surfaces from gouges.
4. Compare the port layout and bolt hole pattern of the new gaskets directly against the cylinder head and manifold mating surfaces before assembly.
5. Follow the engine manufacturer's service manual for fastener tightening sequence, torque specifications, and post-installation inspection. If any exhaust leak or abnormal temperature occurs during operation, shut down the engine immediately and inspect the joint.

The Serdamarine Approach

Exhaust parts need a configuration match. Serdamarine focuses on marine exhaust manifolds and their related service parts. Application details, connection requirements and public reference numbers are presented together to support part selection.

Questions Before Replacement