5523639 MOPAR Block Standard Chrysler Hemi

Review MOPAR Chrysler 331 Block Standard Bore for CHRYSLER HEMI 1955

Mopar 5523639 Chrysler 331 Hemi Block - Standard (1955)

The Mopar 5523639 Chrysler 331 Hemi Block is a crucial component for any classic car restoration or hot rod project based on a 1955 Chrysler Hemi engine. This is a standard cast iron block, engineered to deliver exceptional power and durability.

The block boasts a classic Hemi design with a distinctive cross-flow intake and exhaust manifold configuration. The Hemi configuration enables superior combustion efficiency and improved power output, making it a favorite among performance enthusiasts.

The Mopar 5523639 Chrysler 331 Hemi Block is made from high-quality cast iron, ensuring a strong and robust structure. The casting process ensures a uniform and precise design, which is essential for optimal engine performance.

This block is designed to accommodate a 331 cubic inch displacement, which is a popular size among hot rodders and restorers. It features a main bearing cap design with 7 main bearings, which provides excellent support to the crankshaft and ensures a stable engine platform.

The block also includes provisions for factory-style, full-flow water jackets, which help maintain optimal engine temperature. The cooling system keeps the engine running efficiently, even during extended periods of high performance driving.

The Mopar 5523639 Chrysler 331 Hemi Block comes ready for installation, with no core or other internal components included. It is designed to be used with a compatible crankshaft, pistons, and other engine components to create a fully functional engine.

In summary, the Mopar 5523639 Chrysler 331 Hemi Block is an essential component for any 1955 Chrysler Hemi engine project. Its robust cast iron construction, classic Hemi design, and compatibility with a wide range of performance components make it an excellent choice for enthusiasts seeking to build a powerful and reliable engine.

Pros and Cons of Buying a Mopar 5523639 Chrysler 331 Hemi Block for a 1955 Vehicle

The Mopar 5523639 Chrysler 331 Hemi block is a popular aftermarket engine option for restoring or building a high-performance 1955 vehicle. This engine block is known for its powerful and durable design, derived from the legendary Chrysler Hemi engines. In this analysis, we will discuss the key advantages and disadvantages of investing in this engine block.

1. Power: The Mopar 5523639 Chrysler 331 Hemi block delivers impressive power output, making it an excellent choice for those seeking maximum performance from their 1955 vehicle.

2. Durability: This engine block is known for its robust design and exceptional durability, which is essential for high-performance applications.

3. Availability: The Mopar 5523639 Chrysler 331 Hemi block is readily available from various aftermarket suppliers, ensuring that enthusiasts can easily source this component for their project.

4. Versatility: This engine block can be used in a wide range of 1955 Chrysler, Dodge, and Plymouth models, making it a versatile option for restorers and hot rod builders.

1. Cost: The Mopar 5523639 Chrysler 331 Hemi block is a premium engine component, and its cost may be prohibitive for some enthusiasts.

2. Complexity: Installing this engine block requires a significant investment of time, expertise, and resources. Enthusiasts must ensure they have the necessary skills and tools to complete the installation process.

3. Customization: To fully realize the potential of the Mopar 5523639 Chrysler 331 Hemi block, enthusiasts may need to invest in additional components, such as a high-performance intake system, exhaust headers, and a fuel injection system.

The Mopar 5523639 Chrysler 331 Hemi block is an excellent investment for those seeking maximum power and durability in their 1955 vehicle. However, it comes with a higher cost and increased complexity compared to stock engine components. Enthusiasts must carefully consider their skills, resources, and goals before deciding to invest in this engine block. Ultimately, if the added power and performance are worth the investment, the Mopar 5523639 Chrysler 331 Hemi block is a top-tier choice for restoring or building a high-performance 1955 vehicle.

If you have the necessary resources, skills, and budget to install and maintain a Mopar 5523639 Chrysler 331 Hemi block in your 1955 vehicle, we strongly recommend considering this engine block for your project. The added power, durability, and versatility will make your vehicle a true standout on the road. However, if you are new to engine swaps or have limited resources, we recommend consulting with a professional mechanic or engine builder for guidance on selecting an alternative engine component that better suits your skill level and budget.

Details:

3.812 is the bore size. It will need to be bored out a small amount clean up. Very hard to find and a nice one rebuild. Again its a standard bore a1 block.

specifications engineblocksam:

• for models: Hemi
• for makes: Chrysler
• for years: 1955
• brand: Mopar
• mpn: 5523639
• type: Engine Block
• material: Cast Iron
• vintage part: Yes

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• policy: no returns

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• # reviews: 1981
• city: morristown, tennessee
• rating: 99.3%

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• category: Auto Parts > Car Truck Accessories > Engines > Blocks

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• prices: $95.00–$1500.00
• item condition:
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• sold #: 13
• availability: in stock
• in stock #: 5
• started: october 15, 2025
• options: seller-arranged-local-pickup

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