JAGUAR AJ812320 Supercharged Right Engine Cylinder Head L405 5.0

( Brand: Jaguar ), ( Manufacturer Part Number: AJ812320 ), ( Part Type: Engine Cylinder Head ), ( Ipn: 5.0l V8 ), ( Oe/oem Part Number: Aj812320, Aj812868, Aj813538, Aj813767, Aj813922 )

Review JAGUAR 5.0 Supercharged Right Engine Cylinder Head Oem fits ROVER RANGE L494 2010–2019

The **Jaguar AJ8 10-19 Rover L405/L494 5.0L Supercharged Right-Hand Engine Cylinder Head** is a meticulously engineered component designed to deliver peak performance and reliability in Jaguar s iconic AJ-V8 engine architecture, specifically tailored for the L405 and L494 applications found in models like the XJ, XKR, and XFR from the 2010 to 2019 model years. Crafted from high-grade cast aluminum with precision machining, this cylinder head embodies Jaguar s commitment to balancing power, efficiency, and durability, making it a critical element in the supercharged 5.0-liter V8 s ability to produce an exhilarating 400 horsepower and 376 lb-ft of torque. The right-hand head features a unique intake manifold porting optimized for the supercharger s forced induction, ensuring a smooth and aggressive airflow that maximizes both low-end torque and high-revving performance. Its integrated valve cover houses a robust timing chain drive system, complete with precision-machined camshaft lobes and hydraulic lifters that maintain consistent valve timing under high-stress conditions, reducing wear while enhancing responsiveness. The head also incorporates advanced cooling passages and a reinforced structure to manage the intense heat generated by the supercharged combustion process, preventing thermal warping and ensuring long-term structural integrity. Whether used in a restoration project, a high-performance rebuild, or as a direct replacement for a worn or damaged original, this cylinder head is a testament to Jaguar s engineering prowess, offering a seamless blend of heritage design and modern performance enhancements. Its compatibility with the AJ8 s fuel injection system, variable valve timing, and supercharger integration makes it an essential upgrade for enthusiasts seeking to restore or enhance the legendary driving dynamics of these powerful V8s.

### **Pros and Cons of Buying a Jaguar AJ812320 (2010 2019 Rover L405/L494 5.0L Supercharged Right-Hand Drive Engine with a Modified or Rebuilt Cylinder Head)**

#### **Pros**

1. **Strong Engine Potential** The 5.0L AJ-V8 supercharged engine, when properly maintained, can produce **400 500 horsepower** with tuning, making it a capable performance engine if the cylinder head is in good condition.

2. **Supercharger Advantage** The supercharger provides a natural boost in power, which can be useful for towing or spirited driving if the engine is well-supported.

3. **Classic Jaguar Character** The AJ-V8 is known for its smooth power delivery and classic Jaguar sound, which appeals to enthusiasts who enjoy the brand s heritage.

4. **Potential for Restoration** If the cylinder head is rebuilt or modified correctly, this engine can be a great project for a restoration, especially in a classic Jaguar model like the XJ or XKR.

5. **Parts Availability** While not as common as modern engines, parts for the AJ-V8 are still available, especially for common failures like timing chains, water pumps, and supercharger components.

6. **Potential for High Mileage Reliability** If the cylinder head has been properly overhauled, the engine can last well beyond 100,000 miles with regular maintenance.

7. **Aftermarket Support** There is a dedicated aftermarket for AJ-V8 engines, including performance upgrades, cylinder head work, and supercharger tuning.

#### **Cons**

1. **Common Engine Issues** The AJ-V8 is notorious for **timing chain stretch, oil leaks, supercharger failures, and cylinder head cracking**, especially if the head has been modified improperly.

2. **Cylinder Head Concerns** If the head is not properly rebuilt or has been modified (e.g., porting, valve job, or incorrect machining), it can lead to **leaking gaskets, warping, or even catastrophic failure**.

3. **High Maintenance Costs** This engine requires **regular oil changes (every 3,000 5,000 miles), timing chain inspection, and supercharger servicing**, which can be expensive.

4. **Fuel Economy** The supercharged 5.0L engine is thirsty, consuming **12 15 MPG in mixed driving**, making it impractical for daily use unless fuel costs are negligible.

5. **Rust and Body Issues** Many older Jaguars (especially XJs) suffer from **rust, electrical problems, and suspension wear**, adding to potential repair costs.

6. **Depreciation** Classic Jaguars, even with a tuned AJ-V8, do not hold value well, making them poor long-term investments unless you plan to keep them as a project or collector s item.

7. **Supercharger Reliability** The supercharger is a common failure point, often requiring **rebuilding or replacement every 50,000 80,000 miles**, adding to maintenance costs.

8. **Driving Experience Limitations** While powerful, the AJ-V8 lacks modern refinements, making it **noisy, vibration-prone, and less comfortable** than contemporary engines.

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### **Conclusion**

Buying a **2010 2019 Rover L405/L494 Jaguar with a 5.0L supercharged AJ-V8 and a modified/rebuilt cylinder head** can be a rewarding project if you are prepared for **high maintenance costs, potential engine issues, and a lack of modern comforts**. The engine has **strong performance potential** if properly maintained, but the **risk of cylinder head failure, supercharger problems, and general reliability concerns** make it a **high-risk purchase** unless you have **mechanical expertise and a budget for repairs**.

If you are an **enthusiast willing to invest time and money** into restoring and tuning the engine, this could be a great project car. However, if you are looking for a **reliable, low-maintenance daily driver**, this engine is **not the best choice** due to its known weaknesses.

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### **Recommendation**

- You have **mechanical experience** or access to a trusted mechanic.

- You are **prepared for high maintenance costs** (oil changes, timing chain, supercharger, cylinder head work).

- You plan to **restore and modify the engine** rather than use it as a daily driver.

- You **inspect the cylinder head thoroughly** (look for cracks, warping, or improper machining).

- You **get a pre-purchase inspection** from someone familiar with AJ-V8 engines.

- You want a **reliable, low-maintenance car**.

- You are **not willing to spend significant money on repairs**.

- The **cylinder head has a history of issues** (e.g., previous cracks, improper modifications).

- You **cannot commit to regular maintenance** (oil changes, supercharger servicing).

**Final Verdict:** This engine is **best suited for experienced enthusiasts** who enjoy **high-performance projects** and are willing to **put in the work** to keep it running. For most buyers, a **modern turbocharged engine or a well-maintained classic with a known-good AJ-V8** would be a safer choice.

Details:

Shipping cost or carrier may change, based on final destination. Item may show light scuffs, scratches or other imperfections as a result of this being used part. 10-19 Range Rover L405 L494 Jaguar XKR 5.0L, Supercharged Right Engine Cylinder Head: 8W936090AC OEM,: Original Land part. All of the parts are tested either before or after removal from vehicle.

Please, do not purchase parts just to check and diagnose your vehicles problem. Large items include: hood, door shell, fender, engine, transmission, trunk hatch, windshield, bumper, reinforcement clip, sub frame, roof, quarter apron, gas tank, etc.

part #: aj812320 prices

• $498.00-$567.99

specifications cylinderheapar:

• for models: L494, Rover, Range
• for makes: Rover, Jaguar
• for years: 2010-2019
• brand: Jaguar
• mpn: Aj812320
• part type: Engine Cylinder Head
• ipn: 5.0l V8
• oe/oem part number: Aj812320, Aj812868, Aj813538, Aj813767, Aj813922

offer cylinderheapar:

• quantity: 1
• best offers: True
• started: February 16, 2026
• availability: In Stock
• sold: 0
• options: Ship-to-home

returns cylinderheapar:

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

payments cylinderheapar:

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

seller cylinderheapar:

• # reviews: 51007
• rating: 99.8%
• city: Pleasant Grove, California

general cylinderheapar:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads

shipping cylinderheapar:

• type: Fixed
• service: FedEx Ground / FedEx Home Delivery
• transit: 3-7 Days
• class: Standard
• cost: $65.00
• carrier: FedEx

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