GLM MARINE
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Mercruiser 330 340 MIE Chevy Marine 454 7.4 7.4L GLM Exhaust Manifolds+4 Risers
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Mercruiser 330 340 MIE Chevy Marine 454 7.4 7.4L GLM Exhaust Manifolds+4 Risers
Mercruiser 330 340 MIE Chevy Marine 454 7.4 7.4L GLM Exhaust Manifolds+4" Risers
Item #: 808485

Mercruiser 330 340 MIE Chevy Marine 454 7.4 7.4L GLM Exhaust Manifolds+4" Risers

75% of respondents would recommend this to a friend

Item #: 808485

XCD 2561

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What Stands Out

High Performance
Designed for Mercruiser 330 and 340 MIE engines, this exhaust manifold and riser system enhances power output and performance, ensuring a reliable boating experience on the water.
Durable Materials
Constructed from high-quality materials, these manifolds resist corrosion and wear, providing long-lasting durability and performance for marine applications, outperforming typical exhaust components.
Easy Installation
Engineered for straightforward installation, the GLM exhaust manifolds and risers save time and labor costs, allowing boat owners to swiftly upgrade their systems without professional assistance.

Product Details

Get the best deals on Mercruiser 330 340 MIE Chevy Marine 454 7.4L GLM Exhaust Manifolds4" Risers at Ubuy Montserrat. Explore a wide range of high-quality marine engine parts and accessories with fast worldwide shipping.
  • Includes two (2) exhaust manifolds and two (2) 4 7° risers (elbows) for Mercruiser MODEL 330-370, V8 (B.B.), GM 454/502 CID (1981 up to 0M SN#’s)
  • Compatible with raw/fresh water cooling systems without spacers
  • Part numbers: (2) 51240 (GL51240)+(2) 51140 (GL51140), equivalent to GLM part number 58242 (GL58242)
  • Not suitable for dry joint exhaust systems
  • The 4 risers are suitable for models from 1981 to early 2000's
  • Signature confirmation required for delivery via UPS

Who Should Buy?

Suitable For
  • Marine Enthusiasts

    Ideal for boat owners desiring reliable, high-performance exhaust manifolds for their Chevy Marine 454 engines.

  • Replacement Needs

    Suitable for users needing to replace worn or damaged exhaust components to maintain engine efficiency and longevity.

  • Performance Modifiers

    Great for those seeking to enhance their marine engine performance with upgraded manifolds and risers.

Not Suitable For
  • Non-Marine Users

    Not suitable for automotive applications; designed specifically for marine environments and configurations.

Product Description

Mercruiser 330 340 MIE Chevy Marine 454 7.4 7.4L GLM Exhaust Manifolds+4" Risers

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Customer Questions & Answers

  • Question: What are the specifications of the Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds?

    Answer: The Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds are designed for optimal performance in marine applications. With a robust construction, these manifolds offer excellent durability and heat resistance, essential for high-output engines. They integrate seamlessly with your existing marine setup, providing efficient exhaust flow and reducing backpressure, which is critical for engine performance and longevity.
  • Question: How do I install the Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds?

    Answer: Installing the Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds requires standard marine tools and attention to detail. Begin by ensuring the engine is cool, then remove the old manifolds carefully. Align the new manifolds with the gasket in place, securing them with the appropriate fasteners. Proper installation is crucial to prevent exhaust leaks and ensure optimal engine performance under load.
  • Question: What materials are used in the construction of these exhaust manifolds?

    Answer: The Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds are typically made from high-quality cast iron or marine-grade materials. This choice of material ensures excellent corrosion resistance, especially in saltwater environments. The durability of these materials enhances longevity and maintains efficiency, making them ideal for marine applications where conditions can be harsh.
  • Question: What are the benefits of upgrading to GLM Exhaust Manifolds?

    Answer: Upgrading to GLM Exhaust Manifolds provides enhanced performance and reliability for your marine engine. These manifolds are designed to improve exhaust flow, reduce engine temperature, and increase horsepower. Furthermore, they are crafted to fit various engine configurations, ensuring compatibility. This upgrade leads to a smoother operation, optimized fuel efficiency, and improved overall engine health.
  • Question: Do the GLM Exhaust Manifolds come with a gasket and hardware?

    Answer: Typically, GLM Exhaust Manifolds do not include gaskets and hardware as part of the package. It is advisable to purchase these separately to ensure compatibility and optimal fit during installation. This allows you to choose gaskets that best meet your specific engine requirements, which can be critical for sealing and performance.
  • Question: Can I use these exhaust manifolds in saltwater conditions?

    Answer: Yes, the Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds are specifically designed to withstand the harsh conditions of saltwater environments. Their corrosion-resistant materials and construction techniques provide durability and longevity, essential for maintaining performance in marine settings. It's crucial to perform regular maintenance to ensure their optimal functioning, prolonging their lifespan.
  • Question: What should I do if my exhaust manifolds start showing signs of wear?

    Answer: If your exhaust manifolds exhibit signs of wear such as corrosion, cracks, or poor sealing, they should be inspected and potentially replaced promptly. Signs of wear can lead to decreased performance, more significant engine issues, or exhaust leaks. Regular maintenance checks are recommended to catch these issues early and ensure your marine engine operates efficiently.
  • Question: How do I know if the Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds are compatible with my engine?

    Answer: To ensure compatibility between the Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds and your engine, check the engine model specifications and compare them against the manifold's fitment details. Manufacturer specifications typically indicate which models can use the manifolds, guaranteeing a proper fit and optimal performance without modification.
  • Question: Where can I buy Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds in Montserrat?

    Answer: You can buy the Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds on Ubuy. They offer a broad selection of marine parts, including these exhaust manifolds, ensuring you get the right product for your needs. Shopping on Ubuy also provides additional resources and customer support to assist with your purchase.
  • Question: Are there any maintenance tips for extending the life of exhaust manifolds?

    Answer: To extend the life of your Mercruiser 330 340 MIE Chevy Marine 454 7.4 GLM Exhaust Manifolds, regular inspection and cleaning are essential. Keep the exhaust system and surrounding areas free of debris and seawater buildup. Check for any signs of leaks or corrosion and address them promptly. Regularly flushing the cooling system can help prevent scaling and overheating, contributing to the manifolds' longevity and performance.

GLM MARINE Manifolds Editorial Review

The Mercruiser 330 340 MIE Chevy Marine 454 7.4 7.4L GLM Exhaust Manifolds+4" Risers is a kit designed to replace exhaust manifolds and risers on various Mercruiser models. According to customer feedback, the kit fits well and is a complete package with gaskets, riser/elbow bolts, and hose fittings. However, it does not include manifold bolts, so buyers may need to purchase those separately. Most customers were satisfied with the product, stating that it worked well and fit their engines perfectly. One reviewer mentioned that the item was exactly as described and fit perfectly in their 80s model Chris-Craft boat. Another customer appreciated the fast shipping and how the kit helped their engine run nice and cool. However, there were a few negative reviews as well. One customer claimed that the exhaust manifolds rotted out and destroyed their engine within a short period of time. They advised others to buy OEM Mercruiser parts instead. Another buyer had a riser seal that melted and had to be replaced by QuickSilver, causing them to hire a mechanic again. Overall, the Mercruiser 330 340 MIE Chevy Marine 454 7.4 7.4L GLM Exhaust Manifolds+4" Risers is a reliable option for replacing exhaust manifolds and risers in compatible Mercruiser models. It is important to note that some buyers may need to purchase additional manifold bolts separately.

Customer Reviews & Ratings

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Pros

  • Fits well and is a complete kit with gaskets, riser/elbow bolts, and hose fittings.
  • Works well and helps the engine run cool, according to satisfied customers.
  • Described as exactly as advertised and fitting perfectly in certain boat models.
  • Fast shipping appreciated by customers.

Cons

  • Does not include manifold bolts, requiring buyers to purchase them separately.

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