AUDI 306-50555 Engine Left Cylinder Head 4H 4.2L V8

( Part Type: Engine Cylinder Head ), ( Donor Year: 2012 ), ( Ipn: 306-50555 ), ( Miles: 135, 193 ), ( Tag: V54623 )

Review AUDI 4h 4.2l V8 Engine Left Cylinder Head Assembly fits A8 D4 2011–2013

The **Audi 306-50555 Cylinder Head (2011 2013 A8 D4 4H, 4.2L V8 Engine, Left Side)** is a precision-engineered component designed to deliver optimal performance, reliability, and efficiency for Audi s high-performance 4.2-liter V8 powertrain found in the luxury D4 generation A8. This left-hand cylinder head is a critical part of the engine s combustion system, featuring a robust construction that supports the demanding requirements of both daily driving and spirited acceleration. Crafted from high-grade aluminum alloy, it incorporates an advanced port design optimized for improved airflow, ensuring better fuel mixture and combustion efficiency while minimizing carbon buildup. The head is equipped with **four intake and four exhaust valves per cylinder**, operated by a **double overhead camshaft (DOHC) system** with hydraulic lifters, allowing for smooth valve actuation and reduced wear over time. The **intake ports** are contoured to enhance turbulence and promote even air distribution, while the **exhaust ports** are designed to facilitate efficient scavenging, contributing to a more responsive throttle response and reduced backpressure. This cylinder head also integrates **Audi s proprietary valve train system**, which includes **solid or hydraulic roller rocker arms** (depending on the specific application) to minimize friction and improve durability. The **spark plug bores** are precisely machined to accommodate standard or high-performance plugs, ensuring consistent ignition and reliable starting. Additionally, the head features **integrated oil passages** for lubrication of the camshafts and rocker arms, as well as **coolant channels** to regulate temperature and prevent overheating, which is particularly important for the high-output 4.2L V8 known for its aggressive power delivery. Whether replacing a worn or damaged head due to overheating, internal stress, or normal wear, this **OEM-quality or high-replica part** ensures a seamless fit with the **4.2L V8 (W06) engine**, maintaining the A8 s signature blend of luxury and performance. For optimal results, it is recommended to pair this component with a **new head gasket, timing chain, and related hardware** to restore full engine integrity and longevity.

### **Pros and Cons of Buying a 2011-2013 Audi A8 (D4, 4.2L V8, 4H) with a Left Cylinder Head Issue**

#### **Pros**

1. **Premium Brand and Reputation**

Audi is a well-regarded luxury brand with strong resale value, brand prestige, and a network of dealerships and specialists for maintenance and repairs. This makes parts and service more accessible compared to some niche or older brands.

2. **Strong Performance and Driving Dynamics**

The 4.2L V8 engine (W06) is a robust powerplant, producing **390 414 hp** (depending on the model year) and delivering smooth, linear power with good throttle response. The **quattro all-wheel-drive system** enhances traction, especially in adverse conditions, and the **7-speed S tronic automatic transmission** (if equipped) provides smooth shifting.

3. **Luxury and Comfort**

The A8 is designed for comfort, with high-quality materials, quiet cabin insulation, and a spacious interior (seating up to five passengers comfortably). Features like **adaptive suspension, heated/ventilated seats, and advanced climate control** contribute to a premium driving experience.

4. **Reliability of the V8 Engine (When Well-Maintained)**

The 4.2L V8 is known for durability if properly serviced. Many examples last **200,000 miles** with regular oil changes, timing belt replacements (every **100,000 miles**), and other scheduled maintenance. The **4.2L is less prone to catastrophic failure** compared to some turbocharged or smaller-displacement engines in luxury cars.

5. **Quattro AWD System**

The **quattro system** is highly reliable and provides excellent grip in snow, rain, or off-road conditions. Unlike some modern AWD systems, it is mechanically robust and less likely to fail prematurely.

6. **Resale Value**

Audi retains strong resale value, especially for well-maintained luxury sedans. Even with a cylinder head issue, a properly documented and repaired example can still hold value better than many competitors.

7. **Advanced Safety Features (Depending on Trim)**

Higher trims (e.g., **S8, Prestige, or 40 TFSI**) come with **adaptive cruise control, lane-keeping assist, blind-spot monitoring, and other safety aids**, which are valuable for long-term ownership.

8. **Customization and Aftermarket Support**

Audi has a strong aftermarket community, allowing for upgrades like **performance exhausts, suspension tuning, or interior enhancements**. The **4.2L V8 also supports tuning** (within limits) for better power delivery.

9. **Low Mileage Options Available**

If you find a **low-mileage example (under 60,000 miles)**, the risk of major issues (including cylinder head problems) is significantly reduced.

10. **Classic Luxury Appeal**

The **D4 A8 (2011 2013)** is a transitional model between the older **C6 (2000 2009)** and the newer **D5 (2014 2017)**. It retains the elegance of the C6 while incorporating modern refinements. Some buyers appreciate its **retro-styled front grille and headlights**, making it a desirable collector s item in the future.

---

#### **Cons**

1. **Cylinder Head Issue (Left Side)**

The **most critical concern** is the **left cylinder head problem**, which has been documented in some **2011 2013 4.2L V8 Audi models (including A8, S8, and Q7)**. The issue involves:

- **Cracking or warping** of the left cylinder head due to **thermal stress, poor cooling, or manufacturing defects**.

- **White smoke from the exhaust** (indicating coolant entering the combustion chamber).

- **Overheating** (especially under load).

- **Misfires, rough idle, or loss of power**.

- **Coolant leaks** (visible under the engine bay).

- **Repair cost**: Replacing a cylinder head on a **4.2L V8 Audi** typically ranges from **$2,500 $4,500 **, depending on labor rates, whether the head needs machining, and if additional components (like gaskets, bolts, or sensors) need replacement.

- **Warranty/Recall Status**: Audi issued a **recall (NHTSA #13V-038)** in 2013 for some affected models, but **not all cases were covered**. A **pre-purchase inspection (PPI) with a trusted mechanic** is **essential** to confirm the extent of the damage.

2. **High Maintenance Costs**

- **Timing belt and water pump replacement ( $1,500 $2,500 every 100,000 miles)**.

- **Suspension components (struts, bushings, control arms)** wearing out ( $1,000 $2,000 per axle).

- **Electrical gremlins** (infotainment glitches, sensor failures).

- **Transmission servicing** (if not a **ZF 7-speed S tronic**, which is more reliable but still requires fluid changes).

3. **Electrical and Infotainment Reliability**

The **MMI (Multimedia Interface) system** and **touchscreen controls** can be **glitchy or unresponsive**, requiring software updates or repairs. Some owners report **intermittent issues with climate control, windows, or locks**.

4. **Transmission Concerns (If Not S tronic)**

Earlier models (pre-2012) may have **older automatic transmissions (e.g., ZF 6HP26)** that are **less refined** than the **7-speed S tronic**. Some owners report **jerky shifts or delayed engagement**, though these are less common in the **4.2L V8 models**.

5. **Fuel Economy and Running Costs**

- The **4.2L V8 is thirsty**, averaging **14 16 MPG highway** (real-world numbers may be lower).

- **Gasoline prices** add up over time, especially for high-mileage owners.

- **Insurance costs** for a luxury AWD sedan will be **higher than average**.

6. **Depreciation and Long-Term Value**

While Audi retains value better than some brands, the **D4 A8 is not a high-demand model** compared to newer Audi sedans or SUVs. If you plan to keep it long-term, **resale value may not be as strong** as a **BMW 5 Series or Mercedes E-Class**.

7. **Potential Rust Issues (If Not Properly Maintained)**

Some **older Audi models** (especially in snowy or salted regions) develop **rust in wheel wells, undercarriage, or rocker panels**. A **thorough inspection** is necessary to check for corrosion.

8. **Parts and Labor Costs**

- **OEM parts** (especially for cylinder heads, suspension, or electrical components) can be **expensive**.

- **Dealership labor rates** are typically **higher than independent shops**, though some Audi specialists offer competitive pricing.

9. **Limited Off-Road Capability (Compared to SUVs)**

While the **quattro system is strong**, the **A8 is a sedan**, meaning it lacks **ground clearance, approach/departure angles, or off-road tuning** found in an **Audi Q7 or S6**.

10. **Noise and Vibration (NVH) Issues**

Some owners report **wind noise at highway speeds**, **road noise through the cabin**, or **engine vibrations** (especially in lower trims). The **S8 and higher trims** are quieter due to better sound insulation.

---

### **Key Considerations Before Purchase**

1. **Verify the Cylinder Head Condition**

- **Get a pre-purchase inspection (PPI) from an Audi specialist** (not just a general mechanic).

- **Coolant leaks** under the engine.

- **White smoke from the exhaust** (especially under acceleration).

- **Overheating tendencies** (check temperature gauge under load).

- **Engine misfires or rough idle**.

- **If the head is cracked or warped**, the repair is **expensive and time-consuming**. Some owners opt to **replace the entire head assembly** ( $3,000 $5,000) rather than machining it.

2. **Check Maintenance Records**

- **Oil changes every 5,000 7,500 miles** (Audi recommends **7,500 miles** for synthetic).

- **Timing belt and water pump replacement** (if not done, **schedule it immediately**).

- **Coolant flush** (old coolant can contribute to cylinder head issues).

- **Suspension and brake service** (worn components can lead to handling issues).

3. **Test Drive and Inspection**

- **Listen

Details:

Initial testing consists of starting the vehicle, running code scans, road if safe to do so, and completing an extensive inspection checklist. Emissions standards, side of road vehicles drive on, etc. Weather patterns cold vs. After items are removed and cleaned they inspected one final time before posting. The more actions option.

There may be normal signs of wear and tear present such as scratches, scuffs, dirt, etc. The pictures are the ACTUAL PICTURES OF THE ITEM FOR SALE. Left-Hand Drive Vehicles.: Item has been fully inspected and tested found to be in good working order.

We subscribe to fitment software and include all relevant useful information in our listings whenever possible. SHIPPING DEALS: Review our shipping details before you purchase. Made for USA Vehicles: All vehicles and parts are manufactured to be sold the market. And cultural preferences income levels, family sizes, typical modes of transportation, etc.

On return this item.

specifications cylinderheapar:

• for models: A8, D4
• for makes: Audi
• for years: 2011-2013
• part type: Engine Cylinder Head
• donor year: 2012
• ipn: 306-50555
• miles: 135, 193
• tag: V54623

payments cylinderheapar:

• wallet: Paypal
• other
• credit card: Discover

returns cylinderheapar:

• time: 60 Days
• paid by: Seller
• policy: Returns Accepted

seller cylinderheapar:

• city: Oroville, California
• rating: 99.9%
• # reviews: 30953

offer cylinderheapar:

• availability: In Stock
• started: May 11, 2026
• quantity: 1
• options: Ship-to-home
• sold: 0

general cylinderheapar:

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

shipping cylinderheapar:

• cost: $0.00
• class: Standard
• type: Fixed
• transit: 3-7 Days
• service: Standard

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