
180403 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $60.00 | Condition is New, 18-0403 sierra 454 7.4L marine intake manifold gasket kit NEW Repl. 27-805722a1, FREE SHIPPING | 100.0% |
![]() | $117.50 | Top Pick! Condition is New, Dometic 118-0403 Mercury'R Intake Gasket Kit Sierra Marine Engine Parts 18-0403, FREE SHIPPING | ![]() |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $67.49 | Top Pick! Condition is New other (see details), SIERRA 18-0403 REPLACES MERCURY INTAKE MANIFOLD GASKET SET 27-805722A, FREE SHIPPING | 100.0% |

The Sierra Marine Intake Manifold Gasket Kit, model number 18-0403-454, is a crucial replacement part for Mariner outboard engines with a displacement of 7.4 liters. This gasket kit, specifically designed for the intake manifold, ensures a proper seal between crucial engine components.
The kit comes with an extensive collection of gaskets, designed to fit various intake manifold configurations. These gaskets are meticulously engineered to provide a perfect seal, preventing any unwanted leakage, and maintaining the optimal performance of your outboard engine. The kit includes gaskets for the intake ports, coolant passages, and other crucial areas of the intake manifold.
The gaskets in this kit are made from high-quality, heat-resistant materials. They are designed to withstand the extreme conditions found in marine environments, including exposure to saltwater, UV rays, and high temperatures. This ensures that the gaskets will last longer than standard gaskets and provide reliable performance even in the most challenging conditions.
Installing the gaskets is a straightforward process. The kit includes detailed instructions, making it easy for even the most novice DIYers to complete the job. The gaskets are also pre-cut to fit precisely into their intended locations, minimizing the risk of installation errors.
By using the Sierra Marine Intake Manifold Gasket Kit, you can ensure that your Mariner outboard engine continues to run at its best. A proper seal between components not only improves performance but also helps prevent costly engine damage. This kit is an essential addition to your marine engine maintenance toolbox.
Pros and Cons of Buying Sierra 180403 18-0403 454 7.4L Marine Intake Manifold Gasket Kit (27-805722a1)
1. Pros:a. Designed specifically for marine applications, ensuring durability and reliability in harsh marine environments.
b. Compatible with various 7.4L marine engines, offering versatility and applicability for a wide range of users.
c. Includes all necessary gaskets for intake manifold replacement, making it a one-stop solution for engine maintenance.
d. Made of high-quality materials, offering improved sealing and reducing the likelihood of leaks and engine damage.
2. Cons:a. The price point may be higher compared to some aftermarket gasket kits, which could be a concern for budget-conscious consumers.
b. Some users have reported that the gaskets may require a more thorough cleaning before installation to ensure a proper seal.
Ending Conclusion:The Sierra 180403 18-0403 454 7.4L Marine Intake Manifold Gasket Kit (27-805722a1) is a high-quality, durable solution for marine engine intake manifold gasket replacement. While it may come with a higher price tag compared to some aftermarket alternatives, its marine-specific design, compatibility with various engine models, and inclusion of all necessary gaskets make it a valuable investment for mariners seeking reliable engine performance.
Recommendation:For those in need of a marine intake manifold gasket kit, the Sierra 180403 18-0403 454 7.4L Marine Intake Manifold Gasket Kit (27-805722a1) is a solid choice. Its marine-specific design, compatibility with various engine models, and comprehensive gasket kit make it a worthwhile investment for maintaining optimal engine performance in marine applications.
Details:
Mercuries part # 27-805722A1. 18-0403 Sierra 454 7.4l Marine intake manifold gasket kit new repl.
specifications inboardfuel:
- for models: Marine, 454
- brand: Sierra
- mpn: 180403
- part type: Intake Gasket Manifold
- warranty: 1 Year
- country of origin: United States
returns inboardfuel:
- paid by: seller
- policy: returns accepted
- time: 30 days
seller inboardfuel:
- # reviews: 479
- rating: 100.0%
- city: kemp, texas
general inboardfuel:
- category: Boat Parts > Inboard Engines Components > Intake Fuel Systems
shipping inboardfuel:
- transit: 5-12 days
- service: usps ground advantage
- class: standard
- carrier: usps
- type: calculated
payments inboardfuel:
- wallet: apple-pay
- credit card: discover
- other
offer inboardfuel:
- availability: in stock
- started: april 26, 2026
- sold #: 6
- prices: $60.00–$117.50
- item condition:
- New
- New other (see details)
- in stock #: 3
- options: ship-to-home
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