MERCURY 51240 Mpi Gm Engine Exhaust Manifold 7.4

( Manufacturer Part Number: 51240 ), ( Part Type: Engine Exhaust Manifold ), ( Country/region Of Manufacture: United States )

Review MERCURY 51240mercruiser 7.4 Mpi Gm Engine Exhaust Manifold fits MERCRUISER MARINE 454 1999

The Mercury 51240 Marine Exhaust Manifold is an essential component of the MerCruiser 7.4 MPI 454 GM marine engine, designed to efficiently manage exhaust gases for optimal performance and emissions compliance. This manifold is a crucial piece of the engine's exhaust system, connecting the engine cylinders to the exhaust outlets.

Crafted from high-strength materials, this Mercury exhaust manifold is engineered to withstand the demanding marine environment. Its robust construction ensures durability and resistance to corrosion, allowing for long-lasting operation even in harsh conditions.

The Mercury 51240 marine exhaust manifold is specifically designed for use with the MerCruiser 7.4 MPI 454 GM marine engine, ensuring a perfect fit and seamless integration. The manifold features a unique design that facilitates efficient exhaust gas flow, reducing backpressure and optimizing engine performance.

Each exhaust manifold is meticulously engineered and manufactured to meet the highest standards of quality. Mercury's team of experienced engineers and technicians utilize advanced design software and state-of-the-art manufacturing techniques to ensure precise dimensions and exceptional fit and finish.

Additionally, the Mercury 51240 marine exhaust manifold is designed to work in conjunction with the engine's exhaust system components, such as the muffler and exhaust pipes, to produce a quiet and efficient exhaust system. This not only enhances the overall operation of the engine but also contributes to a more enjoyable boating experience for passengers.

In summary, the Mercury 51240 marine exhaust manifold is a vital component of the MerCruiser 7.4 MPI 454 GM marine engine. Its robust construction, efficient design, and perfect fit make it an essential investment for boat owners seeking optimal engine performance and emissions compliance in a marine environment.

Pros and Cons of Buying a Mercury 51240 Mercruiser 7.4 MPI 454 GM Marine Engine Exhaust Manifold

a. High Performance: The Mercury 51240 exhaust manifold is designed for high-performance applications. It is engineered to provide efficient exhaust gas flow, which can lead to improved engine power and fuel efficiency.

b. Durable Construction: The manifold is made from cast iron, a material known for its strength and durability. This ensures that it can withstand the harsh marine environment and the high temperatures generated by the engine.

c. Easy Installation: The exhaust manifold comes with a gasket and bolts, making the installation process relatively straightforward for experienced DIYers or professionals.

d. OEM Quality: This aftermarket exhaust manifold is a direct replacement for the original equipment manufactured by Mercury, ensuring a perfect fit and function.

a. Cost: The Mercury 51240 exhaust manifold may be more expensive than some aftermarket alternatives or used parts. However, the high-quality materials and performance benefits may justify the investment for some boat owners.

b. Weight: The cast iron construction adds weight to the engine, which could impact the overall weight distribution of the boat. Although the weight difference is minimal, it is essential to consider this factor, especially for smaller or lighter boats.

c. Availability: Depending on the location and availability, it might take some time to source and receive the Mercury 51240 exhaust manifold.

The Mercury 51240 exhaust manifold offers several advantages, including high performance, durable construction, easy installation, and OEM quality. However, it comes with some potential drawbacks, such as cost, weight, and availability. Boat owners looking for a high-performance aftermarket exhaust solution and those who prioritize durability and OEM fitment should consider this option.

If you are in the market for a new exhaust manifold for your Mercury 5.7L or 6.2L marine engine and are seeking high-performance, durability, and OEM fitment, the Mercury 51240 exhaust manifold is a solid choice. This aftermarket part offers numerous benefits, making it an excellent investment for boat owners who value quality and performance. However, it is essential to weigh the pros and cons carefully and consider your budget and installation capabilities before making a purchase.

Details:

What you see in the pictures is what get. Mounting hardware is only included if it shown in the pictures. Please look at all pictures and read entire before buying. Look at pictures closely and ask any questions, I try to describe parts as best can.

I will do my best to resolve the issue. Thanks -Mike. Part was removed from a 1999 7.4 MPI MerCruiser Marine engine. Shelf 29-15-5.

Condition: Good used condition.

part #: 51240 prices

• $699.95-$899.97

specifications otsterndriv:

• for models: Marine, 454, Mercruiser
• for makes: Mercury
• for years: 1999
• mpn: 51240
• part type: Engine Exhaust Manifold
• country/region of manufacture: United States

general otsterndriv:

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

shipping otsterndriv:

• service: FedEx Ground or FedEx Home Delivery, USPS Ground Advantage, USPS Priority Mail
• class: Standard, Expedited
• carrier: FedEx, USPS
• cost: $99.30
• transit: 4-9 Days
• type: Calculated

payments otsterndriv:

• credit card: Mastercard
• wallet: Google-pay
• other

seller otsterndriv:

• # reviews: 105599
• city: Huron, Ohio
• rating: 99.2%

offer otsterndriv:

• options: Ship-to-home
• started: June 28, 2025
• quantity: 1
• availability: In Stock
• sold: 0

returns otsterndriv:

• paid by: Buyer
• policy: Returns Accepted
• time: 30 Days

Mercury 51240 Is Similar To:

• 862365 Mercury Mercruiser Mag Horizon Ho Engine Cover Like New Near (46.8% similar) Decals are in great condition. A few small scratches. In great near perfect condition...(October 14th, 2018)
• 10-35366 Mercury Mercruiser Stern Drive Engine Screw (49.6% similar) New oem part...(October 25th, 2018)
• 10-42253 Mercury Mercruiser Alpha Bravo Stern Drive Pivot Bolt (38.5% similar) Ii 0D469859 thru 0F679999 mercruiser alpha one gen. Cat new oem part. Mercury pivot bolt this bolt is for use on various mercruiser stern drives. Feel free to call and order. Ii 0F680000 thru 0K999999 mercruiser alpha one gen. Fits:alpha one gen...(September 29th, 2018)
• 10-49956 Quicksilver Mercury Mercruiser Bravo Alpha Oil Pan Drain Screw (37.5% similar) Quicksilver drain screw for use on many mercruiser, bravo alpha stern drive engines. Over 100 mercruiser stern drives use this oil pan drain plug...(October 1st, 2018)
• 10-59645 Quicksilver Mercury Mariner Mercruiser Alpha Bravo Screw (37.7% similar) New oem part. 750FOR various mercury mariner outboard and mercruiser stern drive engines. Quicksilver screw...(October 23rd, 2018)
• 10-805611 Quicksilver Mercury Mercruiser Bravo Manifold Bolt (45.1% similar) 4l related part numbers: number quicksilver bolt for use on 4l V-8 gm mercruiser bravo ii stern drive engines from mercury 2 v8...(October 7th, 2018)
• 105255 Mercruiser Mercury Trim Tilt Pump Solenoid (41% similar) It is in good working condition. It comes as pictured. Trim pump this is a used mercruiser with 1 solenoid as pictured. The return line hole appears to be stripped, see pictures...(September 30th, 2018)
• 105921 Mercury Power Trim Pump Works Tested Mercruiser (31.5% similar) Good used condition working order...(January 23rd, 2019)
• 105932 Mercury Power Pump Mercruiser Sterndrive (40% similar) ...(October 20th, 2018)
• 11-32522 Mercury Pack Of Mercruiser Vintage Gimbal Splined Nut (44.4% similar) Part number mercury marine splinted screw nut transom plate to gimbals housing new oem factory that is now obsolete. For use on vintage mercruiser stern drive engines from fits: I thru IA Ibo ICC package of...(February 18th, 2019)
• 11-41527t 41527 Mercury Mercruiser Alpha Stern Drive Nut Nla (39.1% similar) For use on mercruiser stern drive engines from fits: alpha one SS all thru none SAM ii iii iv v trs up cat mercury marine lock nut new oem factory part that is now obsolete...(October 6th, 2018)