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27-807473A1 Intake Gasket Set for Mercury Volvo Penta 5.0L 5.7L 6.2L | JLM Marine
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27-807473A1 Intake Gasket Set for Mercury Volvo Penta 5.0L 5.7L 6.2L | JLM Marine
This intake gasket set is engineered for Mercury MerCruiser and Volvo Penta V8 engines with displacements of 5.0L, 5.7L, and 6.2L. It is designed for Gen II Vortec models from 1996 and up equipped with an 8-bolt intake manifold, ensuring reliable sealing and optimal engine performance across a wide range of stern drive applications.
Direct Replacements: This gasket set replaces Mercury MerCruiser part number 27-807473A1, OMC part numbers 3857662 and BRP 3856394, Volvo Penta part numbers 287753 and 3857662, and Sierra part number 18-0488.
- Includes 2 intake gaskets for complete installation
- Fits GM 5.0L, 5.7L Gen II Vortec, and 6.2L MX engines
- Compatible with both MerCruiser and Volvo Penta applications
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury MerCruiser | 27-807473A1 |
| OMC | 3857662 |
| BRP | 3856394 |
| Volvo Penta | 287753 |
| Volvo Penta | 3857662 |
| Sierra | 18-0488 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
| Brand | Model | Years | Serial Number Range | Notes |
|---|---|---|---|---|
| MerCruiser / Volvo Penta | 5.0L, 5.7L engines | 1997–present | — | 8-bolt intake, 1996 & up |
| MerCruiser | MCM 350 Mag, 5.0L & 5.7L/LX Gen II | 1996–up | — | 8-bolt intake |
| MerCruiser | GM 305 V8 - 5.0L Gen+ | 1998–2012 | S/N 0L015751 and up | — |
| MerCruiser | 5.0L EFI Gen+ | 1998–2001 | S/N 0L012052 – 0M299999 | — |
| MerCruiser | 5.0L MPI | 2002–2012 | S/N 0M300000 and up | — |
| MerCruiser | 5.0L MPI, EC | 2008–2012 | S/N 1A300000 and up | — |
| MerCruiser | 350 Mag Alpha EFI (Gen +) | 1996–1997 | S/N 0F800300 – 0K999999 | — |
| MerCruiser | 350 Mag Bravo MPI (Gen +) | 1996–1997 | S/N 0F602000 – 0K999999 | — |
| MerCruiser | 350 Mag EFI Ski (Gen +) | 1996–1997 | S/N 0F820707 – 0K999999 | — |
| MerCruiser | 350 Mag MPI (Gen +) | 1998–2001 | S/N 0L010019 – 0M299999 | — |
| MerCruiser | 350 Mag MPI | 2002–2012 | S/N 0M300000 and up | — |
| MerCruiser | 350 Mag MPI EC | 2008–2012 | S/N 1A300000 and up | — |
| MerCruiser | 350 Mag MPI Horizon | 2002–2007 | S/N 0M300000 – 1A299999 | — |
| MerCruiser | 350 Mag MPI Horizon MIE | 1999–2001 | S/N 0L304700 – 0M299999 | — |
| MerCruiser | 350 Mag MPI Horizon MIE | 2002–2007 | S/N 0M300000 – 1A089999 | — |
| MerCruiser | 350 Mag MPI MIE (Gen +) | 1998–2001 | S/N 0L002008 – 0M299999 | — |
| MerCruiser | 350 Mag MPI MIE (Gen +) | 2002–2007 | S/N 0M300000 – 1A089999 | — |
| MerCruiser | 350 Mag MPI Ski (Gen +) | 1998–2001 | S/N 0L002600 – 0M299999 | — |
| MerCruiser | 350 Mag MPI Ski | 2002–2007 | S/N 0M300000 – 1A089999 | — |
| MerCruiser | 5.7L (Gen +) | 1998–2012 | S/N 0L010037 and up | — |
| MerCruiser | 5.7L EFI (Gen+) | 1998–2001 | S/N 0L010035 – 0M299999 | — |
| MerCruiser | 5.7L EFI MIE (Gen+) | 1997 | S/N 0K040300 – 0K999999 | — |
| MerCruiser | 5.7L MIE (Gen+) | 1998–2012 | S/N 0L002003 and up | — |
| MerCruiser | 5.7L MPI Horizon MIE | 2008–2012 | S/N 1A090000 and up | — |
| MerCruiser | 5.7L MPI MIE | 2008–2012 | S/N 1A090000 and up | — |
| MerCruiser | 5.7L MPI MIE EC | 2008–2012 | S/N 1A090000 and up | — |
| MerCruiser | 5.7L MPI Ski | 2008–2012 | S/N 1A090000 and up | — |
| MerCruiser | 5.7L MPI Ski EC | 2008–2012 | S/N 1A090000 and up | — |
| MerCruiser | 5.7L Comp. Ski | 1998–2012 | S/N 0M317000 and up | — |
| MerCruiser | 5.7LX Bravo EFI (Gen+) | 1996–1997 | S/N 0F800300 – 0K999999 | — |
| MerCruiser | Black Scorpion Ski (Gen+) | 1996–2007 | S/N 0F800000 – 0W698432 | — |
| MerCruiser | Scorpion 350, EC | 2008–2012 | S/N 0W698433 and up | — |
| MerCruiser | GM 377 V8 - 377 Mag, EC | 2008–2012 | S/N 1A300000 and up | — |
| MerCruiser | 377 Scorpion MCM | 1999–2005 | S/N 0L416146 – 0M907201 | — |
| MerCruiser | 377 Scorpion Ski (Gen+) | 1997–1998 | S/N 0K000656 and up | — |
| MerCruiser | MX 6.2L MPI | 2000–2007 | S/N 0L680003 – 1A299999 | — |
| MerCruiser | MX 6.2L MPI Horizon | 2002–2007 | S/N 0M300000 – 1A299999 | — |
| MerCruiser | MX 6.2L MPI Horizon MIE | 2002–2012 | S/N 0M300000 and up | — |
| MerCruiser | MX 6.2L MPI MIE | 2002–2012 | S/N 0M300000 and up | — |
| MerCruiser | MX 6.2L MPI MIE, EC | 2009–2012 | S/N 1A091600 and up | — |
| MerCruiser | MX 6.2L MPI Ski | 2002–2012 | S/N 0M317000 and up | — |
| MerCruiser | MX 6.2 Blk Scorpion Ski | 2001–2008 | S/N 0L670015 – 0W698432 | — |
| MerCruiser | Scorpion 377 | 2008–2012 | S/N 0W698433 and up | — |
| MerCruiser | Scorpion 377, EC | 2009–2012 | S/N 1A091488 and up | — |
| Volvo Penta | 5.0GL-A to 5.0GL-HF | — | — | — |
| Volvo Penta | 5.0GXi-A to 5.0GXi-J | — | — | — |
| Volvo Penta | 5.0OSi-B to 5.0OSi-GF | — | — | — |
| Volvo Penta | 5.7OSi-A to 5.0Si-GF | — | — | — |
| Volvo Penta | 5.7GI-A to 5.7GI-GF | — | — | — |
| Volvo Penta | 5.7GiI-A to 5.7GiI-G | — | — | — |
| Volvo Penta | 5.7GL-A to 5.7GL-E | — | — | — |
| Volvo Penta | 5.7GSiL all models | — | — | — |
| Volvo Penta | 5.7GXi all models | — | — | — |
| Volvo Penta | 5.7OXi all models | — | — | — |
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 27-807473A1 |
| Engine Type | GM V8 Gen II Vortec |
| Displacement | 5.0L, 5.7L, 6.2L |
| Intake Manifold Type | 8-Bolt |
| Application | MerCruiser OMC, Volvo Penta Stern Drive |
| Compatibility Years | 1996 and up |
Package Contents
This intake gasket set includes the following components:
- 2 × Intake Gaskets
Installation Guide
- Disconnect the battery and allow the engine to cool completely before beginning work.
- Remove the air intake assembly, throttle body, and any hoses or electrical connections attached to the intake manifold.
- Carefully unbolt and remove the intake manifold, taking note of bolt torque sequence for reinstallation.
- Thoroughly clean the intake manifold and cylinder head mating surfaces, removing all old gasket material and debris.
- Inspect the surfaces for warping or damage; if necessary, have them professionally resurfaced.
- Position the new intake gaskets on the cylinder heads, ensuring proper alignment with all bolt holes and ports.
- Reinstall the intake manifold carefully, avoiding shifting the gaskets out of position.
- Hand-tighten all intake manifold bolts first, then torque to manufacturer specifications in the recommended sequence (typically center-out pattern).
- Reconnect all hoses, throttle body, electrical connections, and air intake assembly.
- Refill coolant if applicable and reconnect the battery.
- Start the engine and allow it to reach operating temperature, checking carefully for leaks around the intake manifold.
- Perform a test run and recheck all connections; retorque bolts if necessary after initial heat cycle.
Troubleshooting & FAQ
Q: How do I confirm this gasket set fits my engine?
A: Verify your engine model, serial number, and year against the compatibility table above. Ensure your intake manifold has an 8-bolt pattern and that your engine is a Gen II Vortec (1996 and up). Cross-reference the OEM part numbers to confirm compatibility.
Q: What are the signs that my intake gaskets need replacement?
A: Common symptoms include coolant or oil leaks around the intake manifold, rough idle, loss of engine power, white exhaust smoke, overheating, or coolant mixing with oil. If you notice any of these issues, inspect and replace the gaskets promptly.
Q: How often should I replace intake gaskets?
A: Intake gaskets should be replaced whenever the intake manifold is removed for service or if leaks develop. Depending on usage and operating conditions, gaskets may last several years, but periodic inspection during routine maintenance is recommended.
Q: Can I reuse the old gaskets if they look okay?
A: No, intake gaskets are designed for single use. Reusing old gaskets—even if they appear intact—can result in improper sealing, leaks, and engine damage. Always install new gaskets when reassembling the intake manifold.
Q: What is the difference between OEM and aftermarket intake gaskets?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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