SUBARU OEM 10103AC870 Block

( Brand: Subaru Oem ), ( Manufacturer Part Number: 10103AC870 ), ( Part Type: Block ), ( Performance Part: Yes )

Review SUBARU OEM Genuine Short Block fits STI

The Subaru STI (Subaru Tecnica International) Block, specifically model number 10103AC870, is a high-performance engine component designed for Subaru's Impreza WRX STI and STI Sedan models. This engine block is an essential part of the internal combustion engine, providing a strong foundation for the other components, including the cylinders, pistons, and crankshaft.

This STI block is made of an aluminum alloy, which offers excellent strength-to-weight ratio and helps to keep the engine light and agile. The aluminum construction also provides improved cooling capabilities, which is crucial for high-performance applications. The block is also designed with a deep skirt, which adds rigidity to the engine and contributes to its impressive power output.

The 10103AC870 STI block features a closed-deck design, which helps to increase the cylinder pressure and reduce the risk of engine blowby. The block also comes with an integrated water jacket, which helps to distribute coolant evenly throughout the engine, ensuring optimal operating temperature. The cylinder bores are finished with a Nitriding process, which enhances the hardness and durability of the cylinder walls, providing excellent wear resistance and improved engine performance.

The STI block also comes with a forged crankshaft and pistons, which provides increased strength and durability, allowing the engine to handle the high-performance demands of the STI models. The block is also equipped with reinforced main caps, which help to distribute the engine's power more evenly and reduce the risk of engine failure.

This STI block is a direct replacement for the original engine block and is designed to fit perfectly into the existing engine bay. It also comes with all necessary gaskets and hardware, making the installation process straightforward and hassle-free. The use of this high-performance STI block results in improved engine power, torque, and overall performance, making it an excellent choice for Subaru WRX STI and STI Sedan owners looking to take their vehicle to the next level.

Buying a Subaru STI (10103AC870) block, which is the engine cylinder block, involves considering several pros and cons to help make an informed decision.

1. High-Performance: The STI block is designed to deliver high-performance capabilities, making it an excellent choice for those seeking power and speed.

2. Durability: Subaru STI blocks are known for their durability and reliability. They can withstand high horsepower and torque levels, making them ideal for modified or high-performance applications.

3. Availability: Replacing a damaged block with a new or remanufactured STI block is a viable option, especially for those who cannot afford to purchase a new vehicle.

4. Cost-Effective: Compared to buying a new car, replacing the engine block of an existing Subaru STI can be a more cost-effective solution.

1. Complex Installation: Installing a new engine block in a Subaru STI requires specialized knowledge and tools. It is a time-consuming and labor-intensive process, which can add to the overall cost.

2. Cost: Replacing an engine block is a significant investment. The cost of purchasing a new or remanufactured block, as well as the labor and parts required for installation, can be substantial.

3. Risk of Damage: During the installation process, there is a risk of damaging other engine components or causing further damage to the block itself.

4. Performance Variability: After installing a new engine block, performance can vary depending on the quality of the block and the skill of the installer.

The decision to buy a Subaru STI (10103AC870) block involves weighing the pros and cons carefully. While the high-performance capabilities, durability, and cost-effectiveness are attractive advantages, the complex installation process, cost, risk of damage, and performance variability must also be considered. Ultimately, the choice depends on individual circumstances, such as the condition of the existing engine, the desired performance level, and the available budget.

For those seeking a high-performance, durable engine block for their Subaru STI, purchasing a new or remanufactured STI block can be a sound investment. However, it is crucial to find a reputable supplier and installer to ensure the best possible outcome. Additionally, thorough research and careful consideration of the pros and cons are essential before making a final decision.

Details:

Fits Baa, Forester, Impress, Legacy, Outback, STI. Engine Assembly - Short Block. Engine Short Block. Engine Gasket Seal Kits are sold separately.

Manufacturer: Subaru OEM, Part Number: 10103AC870, condition: New: OEM # 10103AC870 10103AB440, 10103AB4409L, 10103AB750, 10103AB910, 10103AB940, 10103AC030.

part #: 10103ac870 prices

• $1999.99-$2853.92

specifications grokengines:

• for models: Sti
• for makes: Subaru
• brand: Subaru Oem
• mpn: 10103ac870
• part type: Block
• performance part: Yes

payments grokengines:

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

shipping grokengines:

• service: Standard
• cost: $0.00
• class: Standard
• type: Fixed
• transit: 4-9 Days

offer grokengines:

• sold: 0
• started: April 5, 2025
• availability: In Stock
• quantity: 1
• options: Ship-to-home

seller grokengines:

• rating: 99.4%
• # reviews: 103168
• city: USA

returns grokengines:

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

general grokengines:

• Car Truck Parts Accessories > Engines Engine Parts > Engines
• condition: New

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