P4510020 MOPAR PERFORMANCE Engine Block Caps R5

Review MOPAR PERFORMANCE R5/p7 Bare Engine Block 4.180 Bore No Main Caps for R5

The Mopar Performance P4510020 R5/P7 Bare Engine Block is a high-performance component designed for use in Chrysler 4.1-liter engines. This engine block is part of Mopar's extensive line of performance parts, engineered to deliver enhanced power and durability.

This R5/P7 Bare Engine Block is a cast iron unit, which provides superior strength and rigidity compared to aluminum blocks. Its design incorporates 4.180 inches bore size, ensuring proper fitment and compatibility with select Chrysler engines. The block features a raised deck design, which allows for increased compression height and improved piston performance.

The P4510020 engine block boasts several upgrades that set it apart from stock blocks. First, it benefits from increased cooling capacity, achieved through the use of larger water jackets. Enhanced cooling helps maintain optimal engine temperatures during high-performance driving conditions, reducing the risk of thermal distress.

Additionally, this engine block comes with 0.030-inch oversized cylinder bores. This improvement allows for the use of performance pistons with larger diameters, which in turn, can support increased power outputs. The oversized bores also enable better ring sealing, reducing the likelihood of oil consumption and combustion chamber leakage.

The P4510020 engine block's surface finish is crucial for its performance. It features a shot-peened surface, which provides improved engine block strength and durability. This process also helps minimize the risk of cracking or distortion during engine assembly and operation.

In summary, the Mopar Performance P4510020 R5/P7 Bare Engine Block is a robust and high-performance component designed for Chrysler 4.1-liter engines. Its upgrades, such as larger water jackets, oversized cylinder bores, and a shot-peened surface finish, make it a valuable addition for those seeking improved power, durability, and reliability for their engine setup.

The Mopar Performance P4510020 R5/P7 bare engine block 4.180 cids is a popular aftermarket option for those looking to build high-performance engines for Dodge and Plymouth vehicles. Here are some pros and cons to consider before making a purchase.

1. High-performance: The Mopar Performance P4510020 R5/P7 engine block is designed for high-performance applications. It has enhanced cooling capabilities, thicker cylinder walls, and stronger main and rod bearings compared to the stock engine block.

2. Durability: The engine block is made from cast iron, which is known for its durability and ability to withstand the increased power and torque of high-performance engines.

3. Availability of aftermarket parts: There are numerous aftermarket parts available for this engine block, making it easier to build a custom high-performance engine.

4. Cost-effective: Compared to other high-performance engine blocks, the Mopar Performance P4510020 R5/P7 engine block is relatively affordable.

1. Weight: The engine block is heavier than the stock engine block, which can add weight to the vehicle and negatively impact fuel economy and acceleration.

2. Complexity: Building a high-performance engine using this engine block requires a significant amount of expertise and knowledge. It is not a project for the faint of heart.

3. Installation: Installing the engine block requires specialized tools and knowledge. It is not a project that can be easily done at home.

4. Potential for noise: Due to the increased power and torque of high-performance engines, there may be an increase in engine noise.

The Mopar Performance P4510020 R5/P7 engine block is an excellent choice for those looking to build a high-performance engine for their Dodge or Plymouth vehicle. Its durability, availability of aftermarket parts, and cost-effectiveness make it an attractive option. However, the weight, complexity, installation requirements, and potential for noise are important considerations to keep in mind before making a purchase.

If you are considering purchasing the Mopar Performance P4510020 R5/P7 engine block for a high-performance build, it is recommended that you have a solid understanding of engine building and the resources necessary to complete the project. Additionally, it is recommended that you consult with a professional mechanic or engine builder to ensure that the project is executed safely and effectively.

Details:

4.180 bore, missing main caps.875 bushed lifters, some APR head studs, nagged good, marks at top of #5 cylinder pictured, roller cam brags must be replaced, light rust from setting, note: must be reconditioned!, nice condition. Mopar Performance P4510020 R5/p7 bare block.

specifications engineblocksam:

• for models: R5
• brand: Mopar Performance
• mpn: P4510020
• type: Engine Block
• material: Cast Iron
• vintage part: Yes
• country of origin: United States

offer engineblocksam:

• sold #: 9
• quantity: 1
• availability: in stock
• options: ship-to-home
• started: march 14, 2026

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general engineblocksam:

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

seller engineblocksam:

• rating: 99.7%
• city: east jordan, michigan
• # reviews: 16013

returns engineblocksam:

• paid by: seller
• time: 30 days
• policy: returns accepted

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