1. Inboard Complete Gas Engines For Sale
  2. sku: 6414440672213604
  3. MERCRUISER MIE-340

MERCRUISER MIE-340 Iv Reverse Rotation Freshwater Block 7.4L 340HP

fits model: Marine, 454.

Mie-340 Mercruiser 454 Gen Iv 7.4l Reverse Rotation 340hp Freshwater Marine Long Block

( Brand: Mercruiser ), ( Manufacturer Part Number: MIE-340 ), ( Part Type: Reverse Block ), ( Stroke: 4-stroke ), ( Warranty: 60 Day ), ( Country Of Origin: United States )

Review MERCRUISER Gen Iv 7.4l Reverse Rotation 340hp Freshwater Long Block fits MARINE 454

Mercruiser MIE-340 454 Gen IV 7.4L Reverse Rotation Marine Engine - Power and Reliability in a Sleek Package

Experience the unparalleled power and efficiency of the Mercruiser MIE-340 454 Gen IV 7.4L Reverse Rotation marine engine. This high-performance marine block is designed to deliver an impressive 340 horsepower, perfect for those seeking a thrilling boating experience.

The Mercruiser MIE-340 is part of the fourth generation of the 454 series, showcasing the culmination of extensive research, development, and refinement. The 7.4L (454 cubic inches) block houses a powerful and robust V8 engine, ensuring smooth and consistent power delivery across various boating conditions.

This engine is equipped with a reverse rotation feature, a unique advantage that allows for better boat handling and maneuverability. This feature is particularly useful when installing the engine on inboard-outboard applications or when space is limited.

Freshwater marine applications can benefit significantly from the Mercruiser MIE-340 454 Gen IV. Its durable design and corrosion-resistant materials ensure a long lifespan, even in the harshest freshwater environments. The engine is also EPA and CARB compliant, making it an ideal choice for boaters who value both performance and environmental responsibility.

The Mercruiser MIE-340 454 Gen IV 7.4L Reverse Rotation marine engine is more than just a power source. It's a statement of superior quality and a testament to the advancements in marine engine technology. Whether you're cruising the open waters, fishing in the deep sea, or simply enjoying a leisurely boat ride, this engine will provide the power, reliability, and efficiency you need to make every moment on the water unforgettable.

**Mercruiser MIE-340 454 Gen IV 7.4L Reverse Rotation 340HP Freshwater Marine Block:** **Pros:**

1. High Power: With a output of 340 HP, this engine provides substantial power for a variety of marine applications.

2. Reverse Rotation: This feature allows for more efficient maneuvering in tight spaces or when docking.

3. Large Displacement: The 7.4L engine size offers a significant amount of power and torque for a smooth and responsive boating experience.

4. Freshwater Marine Block: This engine is specifically designed for freshwater use, ensuring it's less susceptible to corrosion and damage from saltwater.

5. Established Brand: Mercruiser is a well-known and reputable brand in the marine industry, offering reliability and support.

**Cons:**

1. Size and Weight: Due to its large displacement and power output, this engine may be heavier and require more space on your boat than smaller engines.

2. Fuel Consumption: With its high power output, fuel consumption may be higher compared to smaller engines.

3. Cost: This engine is a premium choice, and as such, it may be more expensive than other options.

4. Maintenance: Like any internal combustion engine, regular maintenance will be required to ensure optimal performance and longevity.

**Conclusion:**

The Mercruiser MIE-340 454 Gen IV 7.4L Reverse Rotation 340HP Freshwater Marine Block offers substantial power, efficient maneuverability, and is designed for freshwater use. However, it's larger size, higher cost, and increased fuel consumption are factors to consider.

If you require a powerful engine, have the space and budget, and plan to use your boat primarily in freshwater, this engine could be a good choice. For smaller boats, less powerful engines, or those operating in saltwater, other options may be more suitable. It's always recommended to consult with a marine professional to ensure the engine is the right fit for your specific needs.

Details:

No salt corrosion or freeze damage; major castings are intact. Recently refinished. Ideal as a direct replacement, rebuild base, or the counter-rotating mate in twin setup. Sold as shown; review all photos and details.

Buyer to verify mounts/ignition/fuel/exhaust for the specific installation. Reasonable offers considered. All valves present; turns freely with excellent compression. Model: MIE 340.

Displacement: 454 cu in 7.4 L. Use History: Freshwater only. Complete long block: block, heads, valve covers, intake manifold, timing/front cover, oil pan, harmonic balance. Rated Output: 340 HP 3800 RPM.

Message your ZIP and delivery type business with dock, terminal, or residential for a quote. Message with any questions; quick responses. Rotation: Reverse. Serial Number: 6152477.

Not included: carburetor, ignition/distributor, exhaust manifolds/risers, accessories, engine stand.

part #: mie340 price

  • $2795.00

specifications completegengin:

  • for models: Marine, 454
  • brand: Mercruiser
  • mpn: Mie-340
  • part type: Reverse Block
  • stroke: 4-stroke
  • warranty: 60 Day
  • country of origin: United States

offer completegengin:

  • started: October 22, 2025
  • best offers: True
  • availability: In Stock
  • sold: 0
  • options: Ship-to-home
  • quantity: 1

shipping completegengin:

  • type: Fixed
  • service: Flat Rate Freight
  • cost: $600.00
  • class: Freight

seller completegengin:

  • city: Chicago, Illinois
  • rating: 100.0%
  • # reviews: 6

payments completegengin:

  • other
  • wallet: Apple-pay
  • credit card: Discover

general completegengin:

  • condition: Used
  • Boat Parts > Inboard Engines Components > Complete Gas Engines

returns completegengin:

  • policy: No Returns
for models: marine, 454, part type: reverse block, stroke: 4-stroke, warranty: 60 day, country of origin: united states,
category: boat parts > inboard engines components > complete gas engines, sku: 6414440672213604,
Mercruiser MIE-340 Is Similar To:
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1 offer $2795.00 USD
  • Used. Offer #1 priced at $2795.00 + $600.00 shipping estimate = $3395.00* total. Complete long block: block, heads, valve covers, intake manifold, timing/front cover, oil pan, harmonic balancer. Recently refinished.+$600.00 shipping

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