Cylinder Head Gasket – Fits Mercury 6-Cylinder Verado Outboards (Replaces 27-8M0033476)
Cylinder Head Gasket – Fits Mercury 6-Cylinder Verado Outboards (Replaces 27-8M0033476) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket – Fits Mercury 6-Cylinder Verado Outboards (Re...
Product Details
This aftermarket Cylinder Head Gasket is engineered to fit Mercury 6-Cylinder Verado outboard engines, specifically 200–300 HP 4-stroke models manufactured between 2005 and 2014. It creates a critical seal between the cylinder head and the engine block, preventing combustion gas leaks and the mixing of coolant and oil.
It serves as a direct replacement for Mercury OEM part numbers 27-895374006, 27-8M0024564, and 27-8M0033476. It is also a cross-reference for WSM aftermarket part 506-50.
- Designed for installation at the engine head and block interface.
- Built to meet or exceed original factory specifications for a reliable seal.
- Package includes one cylinder head gasket.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 27-895374006 | Superseded part number |
| Mercury | 27-8M0024564 | Superseded part number |
| Mercury | 27-8M0033476 | Current primary OEM part number |
| WSM | 506-50 | Aftermarket direct replacement |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed exclusively for the following Mercury Verado engines. Check your engine's serial number to ensure an exact match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 200 PRO VERADO (6 CYL.) | 200 | 4-Stroke | 2005–2013 | 27-8M0033476 | Serial Range: 2B034840 THRU 2B144122 |
| Mercury | 200 PRO VERADO (6 CYL.) | 200 | 4-Stroke | 2013–2014 | 27-8M0033476 | Serial Range: 2B144123 & Up |
| Mercury | 200 VERADO (6 CYL.) | 200 | 4-Stroke | 2013–2014 | 27-8M0033476 | Serial Range: 2B144123 & Up |
| Mercury | 225 VERADO (6 CYL.) | 225 | 4-Stroke | 2013–2014 | 27-8M0033476 | Serial Range: 2B144123 & Up |
| Mercury | 250 PRO VERADO (6 CYL.) | 250 | 4-Stroke | 2006–2013 | 27-8M0033476 | Serial Range: 1B830170 THRU 2B144122 |
| Mercury | 250 PRO VERADO (6 CYL.) | 250 | 4-Stroke | 2013–2014 | 27-8M0033476 | Serial Range: 2B144123 & Up |
| Mercury | 250 VERADO (6 CYL.) | 250 | 4-Stroke | 2013–2014 | 27-8M0033476 | Serial Range: 2B144123 & Up |
| Mercury | 275 VERADO (6 CYL.) | 275 | 4-Stroke | 2013–2014 | 27-8M0033476 | Serial Range: 2B144123 & Up |
| Mercury | 300 PRO VERADO (6 CYL.) | 300 | 4-Stroke | 2006–2013 | 27-8M0033476 | Serial Range: 1B830170 THRU 2B144122 |
| Mercury | 300 PRO VERADO (6 CYL.) | 300 | 4-Stroke | 2013–2014 | 27-8M0033476 | Serial Range: 2B144123 & Up |
| Mercury | 300 VERADO (6 CYL.) | 300 | 4-Stroke | 2013–2014 | 27-8M0033476 | Serial Range: 2B144123 & Up |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Engine Head/Block Interface
- Dimensions
- Length: 27.2 in (69.0 cm), Width: 11.8 in (30.0 cm), Height: 0.2 in (0.5 cm)
- Weight
- 0.55 lb (0.25 kg)
- Warranty
- Manufacturer standard warranty
- OEM GTIN
- 745061668874
What’s in the Box
- 1 x GASKET Head (27-8M0033476)
Installation Notes
- Disconnect the battery and drain the engine coolant completely.
- Remove the exhaust and intake manifolds, fuel lines, and any other components obstructing the cylinder head.
- Carefully loosen the cylinder head bolts in the reverse order of the manufacturer's tightening sequence.
- Lift the cylinder head off the engine block and remove the old head gasket.
- Thoroughly clean both the cylinder head and engine block surfaces. Ensure they are free of any old gasket material, oil, or debris.
- Position the new head gasket correctly on the engine block; check for proper alignment with dowel pins.
- Carefully place the cylinder head back onto the block.
- Install and tighten the head bolts to the manufacturer's specified torque and sequence. This step is critical for a proper seal.
- Reassemble all previously removed components.
- Refill the engine with coolant, reconnect the battery, and check for any leaks after starting the engine.
Troubleshooting & FAQ
How do I know if my cylinder head gasket is failing?
Common signs of a blown head gasket include significant engine overheating, sweet-smelling white smoke from the exhaust (burning coolant), milky or frothy engine oil (coolant contamination), unexplained coolant loss, or a loss of engine compression and power.
Will this fit my 2015 Verado? The table only goes to 2014.
This gasket is specified for Verado models up to 2014. For a 2015 or newer model, you must verify the required OEM part number for your engine's specific serial number before ordering, as part requirements may have changed.
Do I need to apply sealant to this gasket during installation?
Most modern multi-layer steel (MLS) head gaskets like this one are designed to be installed dry. Applying additional sealants can interfere with the gasket's ability to seal properly. Always follow the specific instructions in your engine's official service manual.
What is the correct torque specification for the head bolts?
Torque specifications and the tightening sequence are absolutely critical and vary by engine model. This information must be obtained from the official Mercury service manual for your specific Verado engine to prevent damage and ensure a lasting repair.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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