1. Boat Parts In Otsterndriv Sterndrive Prices For Sale.
  2. sku: 4673886341884793
  3. GM M821-7-A

GM M821-7-A Exhaust Manifold Port 5.0L 5.7L V8

fits model: Marine, Mercruiser. make: Volvo, Penta.

M821-7-a Gm Marine Exhaust Manifold Port 5.0l 5.7l V8 Mercruiser Volvo Penta

( Brand: Gm ), ( Manufacturer Part Number: M821-7-A ), ( Part Type: Exhaust Manifold )

Review GM Exhaust Manifold Port 5.0l 5.7l V8 Volvo Penta fits MERCRUISER MARINE

Introducing the GM M821-7-A Marine Exhaust Manifold, a high-performance solution designed specifically for 5.0L and 5.7L V8 Mercruiser and Volvo Penta applications. This exhaust manifold is an essential component of your marine engine system, responsible for collecting exhaust gases from multiple cylinders and directing them to the exhaust system.

Crafted from premium materials, this marine exhaust manifold boasts superior strength and durability. It features a robust design with a five-port configuration, allowing for optimal exhaust gas flow and efficient combustion. The ports are engineered with precise dimensions to ensure a perfect fit with compatible marine engines, ensuring a secure and leak-free connection.

The GM M821-7-A Marine Exhaust Manifold is designed with marine-specific requirements in mind. It is manufactured to meet the rigorous demands of the marine environment, including exposure to saltwater, UV radiation, and extreme temperatures. The manifold's material has excellent resistance to corrosion and erosion, ensuring a long service life and minimal maintenance requirements.

Installation of this marine exhaust manifold is made easy with straightforward bolt-on design, requiring no extensive modifications to your engine. The included gaskets ensure a reliable seal between the manifold and the engine, ensuring efficient exhaust gas flow and minimal exhaust leakage.

In summary, the GM M821-7-A Marine Exhaust Manifold is an essential upgrade for any marine engine, providing superior strength, durability, and performance. Its marine-specific design ensures a perfect fit and reliable operation in even the most challenging marine environments. With its easy installation and minimal maintenance requirements, this marine exhaust manifold is an excellent investment for boat owners seeking to enhance the performance and longevity of their engine system.

Buying a GM M821-7-A marine exhaust manifold for a 5.0L or 5.7L V8 Mercruiser or Volvo Penta engine can have several advantages and disadvantages. Here are some potential pros and cons:

Pros:

1. OEM Compatibility: The M821-7-A manifold is an original equipment manufacturer (OEM) part, meaning it is designed to fit and function optimally with the engine it is intended for.

2. Durability: OEM parts are known for their durability and reliability, which can save you money in the long run by reducing the need for frequent repairs or replacements.

3. Better Performance: A new manifold can improve engine performance by ensuring a proper exhaust gas flow and reducing back pressure.

4. Improved Fuel Efficiency: A more efficient exhaust system can lead to improved fuel economy, which can save you money on fuel costs over time.

5. Peace of Mind: Installing an OEM part can give you peace of mind knowing that the part is warrantied and has been tested to meet the manufacturer's specifications.

Cons:

1. Cost: OEM parts can be more expensive than aftermarket parts, which may be a deterrent for some buyers.

2. Availability: OEM parts may be harder to find than aftermarket parts, especially if the engine model is no longer in production.

3. Longer Installation Time: Installing an OEM part may take longer than installing an aftermarket part because it requires more precise fitting and alignment.

4. Potential for Compatibility Issues: While the M821-7-A manifold is designed to fit the Mercruiser and Volvo Penta engines mentioned, there is always a possibility of compatibility issues that may require additional modifications or adjustments.

Conclusion:

The decision to buy a GM M821-7-A marine exhaust manifold for a 5.0L or 5.7L V8 Mercruiser or Volvo Penta engine ultimately depends on your priorities and budget. If you value the durability, reliability, and performance benefits of an OEM part and have the means to afford it, then this may be the best option for you. However, if you are looking for a more cost-effective solution or are unsure of the availability of the part, then an aftermarket alternative may be worth considering.

Recommendation:

If you have the budget and are looking for the best possible fit and performance for your engine, then I would recommend purchasing a new GM M821-7-A marine exhaust manifold from a reputable dealer or supplier. Make sure to double-check that the part is compatible with your specific engine model and application before making the purchase. If you are on a tighter budget or are unsure of the availability of the OEM part, then you may want to consider exploring aftermarket alternatives from trusted manufacturers or suppliers. Regardless of which option you choose, make sure to follow all installation instructions carefully to ensure proper fitting and functionality of the new manifold.

Details:

GM Marine Exhaust Manifold Port 5.0L 5.7L V8 Mercruiser Volvo Penta M821-7-A. Buyer Pays Return Shipping.

part #: m8217 price

  • $200.00

specifications otsterndriv:

  • for models: Marine, Mercruiser
  • for makes: Volvo, Penta
  • brand: Gm
  • mpn: M821-7-a
  • part type: Exhaust Manifold

payments otsterndriv:

  • credit card: Mastercard
  • other
  • wallet: Paypal

offer otsterndriv:

  • quantity: 1
  • started: January 13, 2026
  • best offers: True
  • sold: 0
  • availability: In Stock
  • options: Ship-to-home

seller otsterndriv:

  • rating: 99.8%
  • # reviews: 432
  • city: Gravois Mills, Missouri

shipping otsterndriv:

  • carrier: USPS, FedEx
  • cost: $87.94
  • service: USPS Ground Advantage, FedEx Ground Economy
  • class: Standard, Economy
  • type: Calculated
  • transit: 10-14 Days

general otsterndriv:

  • Boat Parts > Sterndrive Motors Components > Other
  • condition: Used

returns otsterndriv:

  • policy: Returns Accepted
  • time: 14 Days
  • paid by: Buyer
for models: marine, mercruiser, for makes: volvo, penta, part type: exhaust manifold,
category: boat parts > sterndrive components, sku: 4673886341884793,
Gm M821-7 Is Similar To:
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1 offer $200.00 USD
  • Used. Offer #1 priced at $200.00 + $94.10 shipping estimate = $294.10* total. +$94.10 shipping

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