27-99757 Exhaust Manifold-to-Head Gasket Set (2 Pc) for MerCruiser V6

SERDAMARINE / MARINE EXHAUST PARTS

Exhaust Manifold-to-Cylinder Head Gasket Set, 2 Pieces

This two-piece aftermarket gasket set seals the exhaust manifold-to-cylinder head joint on specified MerCruiser, Volvo Penta, and OMC Cobra marine engine applications, including V6 4.3L and 4.5L engines referencing MerCruiser 27-99757.

It is designed specifically for the manifold-to-cylinder head mounting surface—not the exhaust elbow or riser joint—and covers listed GM V6 229/262 CID (Model 175–205) and GM V6/V8 small-block Dry Joint configurations (including 2002–2004 7° and 2005–2010 14° exhaust designs).

Configuration & Specifications

Engine Applications

This gasket set applies to the marine engine families and exhaust configurations listed below. Select this set by matching your engine's required manifold-to-cylinder head gasket part number, serial number range, and Dry Joint year/angle configuration rather than relying on engine displacement alone.

• MerCruiser, Volvo Penta, and OMC Cobra Stern Drive — V6 4.3L & 4.5L Applications
  For engines specifying the listed manifold-to-cylinder head gasket reference numbers. Fits when specified: Must match the required engine-specific manifold-to-cylinder head gasket part number.
• Model 175-205 — V6, GM 229/262 CID (1983 - 0M Serial Numbers)
  Years: 1983 through 0M serial numbers. Fits when specified: For GM 229/262 CID V6 engines within the 1983 to 0M serial number range.
• Chevy V6
  Marine exhaust manifold-to-cylinder head joint applications referencing the listed part numbers. Fits when specified: Must require one of the listed manifold-to-cylinder head gasket references.
• GM V6 & V8 Small Block — Dry Joint (2002–2004) - 7°
  Years: 2002–2004. Exhaust Configuration: Dry Joint with 7° design angle. Fits when specified: For 2002–2004 Dry Joint 7° configuration at the manifold-to-cylinder head joint.
• GM V6 & V8 Small Block — Dry Joint (2005–2010) - 14°
  Years: 2005–2010. Exhaust Configuration: Dry Joint with 14° design angle. Fits when specified: For 2005–2010 Dry Joint 14° configuration at the manifold-to-cylinder head joint.
• GM V6 & V8 Small Block — Dry Joint “Alternative” (0M Serial Numbers & Up)
  Serial Number Range: 0M serial numbers and up. Exhaust Configuration: Dry Joint “Alternative”. Fits when specified: For 0M and up serial numbers requiring the manifold-to-cylinder head gasket in Dry Joint exhaust systems.

Additional model-specific applications

• OMC 4.3L — GM 262 CID, V6, from 1986 onward

Reference Numbers

The numbers below are provided for part identification and cross-reference only; they do not alone guarantee interchangeability across all engine variations or indicate that this aftermarket set is produced by the original equipment manufacturer. Retain all leading zeros and suffixes when comparing part numbers.

Supplied Parts

• Exhaust manifold-to-cylinder head gaskets (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, shut off, and secured against accidental starting before servicing the exhaust system.
2. Support the weight of the exhaust manifold during removal and installation to prevent damage to mounting bolts, studs, or cylinder head threads.
3. Clean and inspect the cylinder head and exhaust manifold mating surfaces, removing old gasket material and corrosion while protecting the sealing surfaces from gouges.
4. Position the gaskets at the exhaust manifold-to-cylinder head joint and verify complete port alignment; do not use these gaskets at the manifold-to-elbow or manifold-to-riser joint.
5. Tighten the manifold mounting hardware following the sequence and specifications in your engine service manual, and inspect for exhaust leaks upon initial startup. Stop the engine immediately and inspect if any abnormal operation or leakage occurs.

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