Description

Mercury 862356 is a genuine OEM exhaust elbow gasket for selected MerCruiser big-block applications. Mercury’s current product listing identifies this gasket specifically for 496 Magnum and 8.1S MerCruiser sterndrive and inboard engines.

Key Features

• Genuine Mercury Marine / Quicksilver OEM gasket
• Part number 862356
• Mercury catalog format: 27-862356
• Identified as an exhaust elbow gasket
• Built for selected MerCruiser exhaust system service applications.

Engine Compatibility
Mercury lists 862356 for 496 Magnum and 8.1S MerCruiser sterndrive and inboard engines. Dealer listings also place it in the 496 / 8.1L exhaust-parts family, but exact fitment should still be confirmed by engine model and serial number before ordering.

Serial Number Fitment Notice
Please confirm compatibility in the Mercury Parts Catalog using your exact engine serial number before purchase. Mercury’s catalog is organized by model and serial number for accurate parts lookup.

When This Part Needs Replacement
Replace this gasket when the exhaust elbow or riser is removed for service, or when the original gasket shows leakage, deterioration, or sealing damage. This service context is supported by dealer listings that place 27-862356 between the riser and manifold on applicable 496 / 8.1L engines.

Installation Notes
Use this gasket only on the exact exhaust assembly that calls for 862356 / 27-862356. Because exhaust gaskets are application-specific, matching by engine model and serial number is the safest way to avoid a mismatch.

Alternate / Superseded Part Numbers

• 27-862356
• Newer superseded Mercury part: 8M0207778
• Common cross-references seen in dealer listings: 62-1583, 2886-1101

Parts Desk Insight
On MerCruiser big-block exhaust systems, the gasket is a small part that does an important sealing job between major cast components. Replacing it whenever the joint is opened up is the smart move, especially on 496 and 8.1L service work where exhaust sealing matters. This is a practical service inference based on the documented exhaust elbow application.

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