Valve Cover Gasket Set – Fits MerCruiser/Volvo/OMC/GM 7.4L/8.2L V8 (Replaces 27-49121, 856626)
Valve Cover Gasket Set – Fits MerCruiser/Volvo/OMC/GM 7.4L/8.2L V8 (Replaces 27-49121, 856626) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Valve Cover Gasket Set – Fits MerCruiser/Volvo/OMC/GM 7.4L/8.2L V8 ...
Product Details
This Valve Cover Gasket Set is designed for MerCruiser, Volvo Penta, and OMC applications using GM-based 7.4L (454 cu in) and 8.2L (502 cu in) V8 engines, specifically for Generation IV and V models from 1991–1998. It provides a reliable seal to prevent oil leaks from the valve covers.
It serves as a direct replacement for multiple OEM and aftermarket parts, including FEL-PRO 17935, MerCruiser 27-49121, Volvo Penta 856626, and Sierra 18-0464.
- Engineered for direct-fit installation.
- Constructed from a durable cork-rubber composite for marine environments.
- Designed to effectively prevent oil leaks and ensure a proper seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| FEL-PRO | 17935 |
| MerCruiser | 27-14765 |
| MerCruiser | 27-49121 |
| MerCruiser | 878981 |
| MerCruiser | 91831 |
| Volvo Penta | 3853513 |
| Volvo Penta | 856626 |
| OMC | 0508723 |
| OMC | 0912768 |
| OMC | 0914791 |
| OMC | 3853513 |
| Sierra | 18-0464 |
| Sierra | 18-25001 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, pay close attention to engine generation (Gen IV, Gen V) and serial number breaks to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 7.4L Blue Water Inboard | 310, 340 | 4-Stroke | Up to 1995 | 27-49121 | Gen IV, up to Ser. No. D715493 |
| MerCruiser | 7.4L Blue Water Inboard | 310 | 4-Stroke | 1995+ | 27-49121 | Gen V, from Ser. No. D715494 |
| MerCruiser | 7.4L Bravo | 300, 330 | 4-Stroke | Up to 1995 | 27-49121 | Gen IV, up to Ser. No. D603117 |
| MerCruiser | 7.4L Bravo I | 300, 330 | 4-Stroke | 1995+ | 27-49121 | Gen V, from Ser. No. D603118 |
| MerCruiser | 7.4L Bravo II | 300, 330 | 4-Stroke | 1995+ | 27-49121 | Gen V, from Ser. No. D603118 |
| MerCruiser | 7.4L Bravo III | 350 | 4-Stroke | 1995+ | 27-49121 | Gen V, from Ser. No. D603118 |
| MerCruiser | 7.4L EFI | 310 | 4-Stroke | 1995+ | 27-49121 | Gen V, from Ser. No. F215800 |
| MerCruiser | 7.4 Gi | 330 | 4-Stroke | 1991–1998 | 27-49121 | Gen V |
| MerCruiser | 7.4 GL | 300 | 4-Stroke | 1991–1998 | 27-49121 | Gen V |
| MerCruiser | 7.4 GSi | 385 | 4-Stroke | 1991–1998 | 27-49121 | Gen V |
| MerCruiser | 740 | 300 | 4-Stroke | 1991–1998 | 27-49121 | Gen IV |
| MerCruiser | 740 DP | 300 | 4-Stroke | 1991–1998 | 27-49121 | Gen IV, Gen V |
| MerCruiser | 820 DPX | 385 | 4-Stroke | 1991–1998 | 27-49121 | Gen V |
| MerCruiser | 7.4L 454 V8 (HP425) | 385, 400, 425 | 4-Stroke | 1991–1998 | 27-49121 | Gen IV & V |
| MerCruiser | 7.4L 454 V8 | 420 | 4-Stroke | 1991–1998 | 27-49121 | Gen IV & V |
| MerCruiser | 7.4L 454 V8 (HP525 SC) | 500 | 4-Stroke | 1991–1998 | 27-49121 | Gen V, supercharged |
| MerCruiser | 454 Magnum Alpha | 330 | 4-Stroke | 1991–1998 | 27-49121 | Gen IV, Ser. No. A631894-B785148 |
| MerCruiser | 454 Magnum Bravo | 350, 365 | 4-Stroke | 1991–1998 | 27-49121 | Gen IV, Ser. No. B721206-D805068 |
| MerCruiser | 454 Magnum Bravo | 350 | 4-Stroke | 1995+ | 27-49121 | Gen V, from Ser. No. D805069 |
| MerCruiser | 330, 340, 350, 370TRS | Various | 4-Stroke | 1991–1998 | 27-49121 | Gen IV |
| MerCruiser | 400 TRS | Various | 4-Stroke | 1991–1998 | 27-49121 | Gen IV |
| MerCruiser | 450 | Various | 4-Stroke | 1991–1998 | 27-49121 | Gen V |
| MerCruiser | 8.2L 502 V8 (HP465) | 465 | 4-Stroke | 1991–1998 | 27-49121 | Gen V |
| MerCruiser | 8.2L 502 V8 (HP600 SC) | 550 | 4-Stroke | 1991–1998 | 27-49121 | Gen V, supercharged |
| MerCruiser | 8.5L | 400 | 4-Stroke | Up to 1995 | 27-49121 | Gen IV, up to Ser. No. D857199 |
| MerCruiser | 8.2L | 400 | 4-Stroke | 1995-1998 | 27-49121 | Gen V, Ser. No. D857200-F819619 |
| MerCruiser | 500 | 470 | 4-Stroke | 1991–1998 | 27-49121 | Gen V |
| MerCruiser | 502 Magnum Bravo | 390 | 4-Stroke | Up to 1995 | 27-49121 | Gen IV, up to Ser. No. D824588 |
| MerCruiser | 502 Magnum Bravo | 390, 415 | 4-Stroke | 1995+ | 27-49121 | Gen V, from Ser. No. D824589 |
| MerCruiser | 8.2L, 502 King Cobra | 375 | 4-Stroke | 1991–1998 | 27-49121 | Gen IV, Gen V |
This gasket set is compatible with the following Volvo Penta models based on the GM 7.4L and 8.2L engine blocks.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 740, 7.4GL, 7.4Gi | 300-330 | 4-Stroke | 1991–1998 | 856626 | Based on GM 7.4L engine |
| Volvo Penta | 8.1 | Various | 4-Stroke | 1991–1998 | 856626 | Based on GM 8.1L engine |
| Volvo Penta | 8.2GL, 8.2GSi | Various | 4-Stroke | 1991–1998 | 856626 | Based on GM 8.2L engine |
For OMC applications, this set fits models based on the GM 454 and 502 engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| OMC | 454 | Various | 4-Stroke | 1991–1998 | 0914791 | Based on GM 454 engine |
| OMC | 502 | Various | 4-Stroke | 1991–1998 | 0914791 | Based on GM 502 engine |
Technical Specs
- Product Type
- Valve Cover Gasket Set
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Housing Material
- Cork-rubber composite
- Dimensions
- 66.0 cm L x 28.0 cm W x 0.5 cm H
- Other Technical Attributes
- Designed for marine applications, prevents oil leaks, fits Generation IV and V GM big block V8 engines
What’s in the Box
- 1 x Valve Cover Gasket Set (Equivalent to FEL-PRO 17935)
Installation Notes
- Ensure the engine is cool and disconnect the battery.
- Remove any components obstructing access to the valve covers.
- Carefully unbolt and remove the old valve covers and gaskets.
- Thoroughly clean the mating surfaces on both the cylinder head and the valve cover. Remove all old gasket material, oil, and debris.
- Place the new gasket onto the valve cover, ensuring it is properly aligned with any bolt holes or locating tabs.
- Carefully position the valve cover and new gasket onto the cylinder head.
- Hand-tighten the bolts, then torque them to the manufacturer's specified sequence and value to ensure even pressure.
- Reconnect any components that were removed and reconnect the battery.
- Start the engine and check for any oil leaks around the valve cover.
Troubleshooting & FAQ
How do I know if my valve cover gasket is failing?
Common signs include a visible oil leak around the edges of the valve cover, a burning oil smell from leaks dripping onto hot exhaust components, a low engine oil level, and a dirty or oil-covered valve cover area.
Does this gasket fit both Generation IV and Generation V engines?
Yes, this gasket set is designed to be compatible with both GM Generation IV and V big block V8 engines within the specified model years. Always check the serial number ranges in the compatibility table to be certain.
What are the benefits of a cork-rubber composite gasket?
Cork-rubber composites offer an excellent balance of compressibility and fluid resistance. The cork allows the gasket to conform to surface imperfections for a tight seal, while the rubber provides durability and resistance to oil and engine fluids.
Is any sealant required during installation?
In most cases, modern gaskets like this are designed to be installed dry. However, it is best practice to consult your engine's service manual. Some applications may recommend a small amount of RTV sealant at corners or joints (e.g., where the intake manifold meets the cylinder head).
How often should valve cover gaskets be replaced?
There is no fixed replacement interval. Gaskets should be replaced whenever they show signs of leaking or during any service that requires removing the valve covers. Regular inspection is recommended.
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.
Payment & Security
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