RX040870AC MOPAR Engine

Review MOPAR Genuine Engine

The Mopar RX040870AC engine is a high-performance replacement powertrain designed specifically for select Chrysler, Dodge, and Jeep vehicles. This engine is a 6.4-liter, SFI-certified, naturally aspirated V8 engine that delivers impressive torque and horsepower, making it an excellent choice for enthusiasts seeking to enhance the power and performance of their vehicles.

The engine block is made of cast iron, ensuring durability and longevity. It features a compact combustion chamber design, which improves thermal efficiency and reduces emissions. The cylinder heads are made of aluminum, and they include high-performance, four-valve combustion chambers with sodium-filled exhaust valves that help maintain optimal engine temperatures.

The engine is equipped with a high-lift, high-duration camshaft that optimizes valve timing and duration for improved power output. The intake and exhaust systems have been upgraded with high-flow intake and exhaust manifolds, respectively, to ensure efficient airflow and optimal exhaust gas exit.

The engine comes with a factory-tuned, electronic fuel injection system that delivers precise fuel delivery for optimal combustion efficiency. The engine management system is also upgraded to support higher performance levels, ensuring that the engine runs smoothly and efficiently under various driving conditions.

The engine includes a high-performance, dual-disc clutch system that provides smooth engagement and improved clamping force for better power transfer to the transmission. It also comes with a high-performance, thick-wall, steel crankshaft and forged connecting rods that improve durability and reduce flex, ensuring that the engine can handle the increased power output.

The Mopar RX040870AC engine is not only powerful, but it is also designed to meet strict emissions standards. It includes advanced emissions control systems, such as a high-performance catalytic converter and an oxygen sensor system, to help reduce harmful emissions and ensure that the engine runs efficiently and effectively.

In summary, the Mopar RX040870AC engine is a high-performance, naturally aspirated V8 engine that delivers impressive power and torque. It features a compact combustion chamber design, high-lift, high-duration camshaft, upgraded intake and exhaust systems, a factory-tuned fuel injection system, advanced emissions control systems, and a high-performance clutch system. This engine is an excellent choice for enthusiasts seeking to enhance the power and performance of their Chrysler, Dodge, or Jeep vehicles.

The Mopar RX040870AC engine is a Chrysler 3.6L Pentastar V6 engine, which is widely used in various Chrysler, Dodge, and Jeep vehicles. Here are some pros and cons of buying this engine:

1. Fuel Efficiency: This engine delivers good fuel economy for a V6 engine, with an estimated 18-28 mpg combined, depending on the vehicle and driving conditions.

2. Power and Torque: With 283 horsepower and 260 lb-ft of torque, this engine provides good power and acceleration for most applications.

3. Durability: The Pentastar engine has a strong reputation for durability, with a robust design and reliable components.

4. Availability: This engine is widely used in Chrysler, Dodge, and Jeep vehicles, making it easy to find parts and service.

5. Flex-Fuel Capable: The engine is flex-fuel capable, which means it can run on both gasoline and ethanol.

1. Maintenance Costs: Like any engine, the Mopar RX040870AC engine requires regular maintenance, and some components may need to be replaced more frequently than others, resulting in higher maintenance costs.

2. Oil Consumption: Some users have reported excessive oil consumption with this engine, which may require more frequent oil changes.

3. Timing Chain Tensioner Issues: There have been reports of timing chain tensioner issues, which can result in engine noise and reduced performance.

4. Transmission Compatibility: This engine is compatible with various transmissions, but some users have reported compatibility issues, which may require the use of specific transmission adapters.

The Mopar RX040870AC engine is a reliable and powerful V6 engine that offers good fuel efficiency and durability. However, it does come with some drawbacks, such as potential maintenance costs, oil consumption, and compatibility issues. Ultimately, whether or not this engine is a good choice for you depends on your specific needs and preferences. If you value power, fuel efficiency, and durability, and are willing to accept the potential drawbacks, then this engine may be a good choice for you. However, if you are looking for an engine with minimal maintenance requirements and no compatibility issues, you may want to consider other options.

If you are considering buying a vehicle with the Mopar RX040870AC engine or are thinking about swapping out an existing engine for this one, I would recommend doing thorough research on the engine's performance, maintenance requirements, and compatibility with your vehicle. Additionally, consider reading user reviews and seeking advice from mechanics or automotive forums to get a better understanding of the engine's strengths and weaknesses. Finally, be sure to factor in the cost of maintenance and potential repairs when making your decision.

Details:

Quirk parts, engine. Genuine Mopar part number: RX040870AC.

specifications engineblocksam:

• brand: Mopar
• mpn: Rx040870ac
• part type: Engine
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• replaces part number: 68040870aa, 68040870ab, 68040870ac, 68040870ad

payments engineblocksam:

• wallet: paypal
• other
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seller engineblocksam:

• # reviews: 1045074
• rating: 98.9%
• city: braintree, massachusetts

general engineblocksam:

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

returns engineblocksam:

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

offer engineblocksam:

• sold #: 17
• in stock #: 1
• started: september 14, 2025
• options: ship-to-home
• best offers: true
• availability: in stock
• price: $3352.58
• item condition: New

shipping engineblocksam:

• class: standard
• service: usps ground advantage
• type: fixed
• transit: 5-11 days
• carrier: usps