PORSCHE 306-PORSCHE Driver Left Lh Cylinder Head 306-50571 3.6L

( Manufacturer Part Number: 306-PORSCHE ), ( Part Type: Driver Cylinder Head ), ( Year: 2014 ), ( Condition And Options: 3.6l, L. ), ( Manufacturer Warranty: 90 Day ), ( Ipn: 306-50571 ), ( Fitment Type: Direct Replacement ), ( Oe Spec Or Performance/custom: Oem Factory Spec ), ( Core Charge: No Core Charge )

Review PORSCHE 3.6l Driver Side Left Lh Cylinder Head Assembly Oem Factory Wty fits PANAMERA 2011–2016

The **Porsche 306-Porsche 11-16 Panamera 3.6L Driver Left (LH) Cylinder Head** is a meticulously engineered, high-performance component designed to deliver the uncompromising power and reliability synonymous with Porsche s legendary engineering. This precision-crafted cylinder head is tailored specifically for the **956/957/962 (306) and 911-16 Panamera (951) models**, featuring the iconic **3.6-liter flat-six (Boxer) engine architecture** that has defined Porsche s racing and road-going heritage since the 1970s. Crafted from **high-grade aluminum alloy**, this head is optimized for superior heat dissipation, ensuring consistent performance under extreme loads while maintaining structural integrity even in the most demanding racing or high-performance driving conditions.

The design incorporates **dual overhead camshafts (DOHC)** with **four valves per cylinder**, allowing for precise airflow management and maximizing combustion efficiency. Each intake and exhaust valve is meticulously machined to Porsche s exacting tolerances, ensuring optimal sealing and minimal restriction. The **piston-to-valve clearance** is carefully calibrated to prevent contact at high RPM, a critical consideration for both endurance racing and spirited driving. The **camshaft lobes** are dynamically balanced to minimize vibration, contributing to the signature smooth yet aggressive power delivery that Porsche engines are renowned for.

For the **3.6L engine variant**, this cylinder head is paired with **fuel injection (Bosch L-Jetronic or later electronic systems)**, ensuring precise fuel-air mixture control for optimal power output and efficiency. The **combustion chamber design** is optimized for high compression ratios, enhancing thermal efficiency while maintaining reliability across a wide operational range. The **spark plug placement** is strategically positioned for even flame propagation, reducing detonation risk and extending engine life.

This cylinder head is also equipped with **high-flow intake and exhaust ports**, allowing for superior airflow dynamics that support both naturally aspirated and forced-induction applications. The **valve springs and retainers** are built to withstand the stresses of high-performance driving, with **titanium or high-strength steel components** where necessary to prevent failure under extreme loads. For racing applications, this head can be further enhanced with **stainless steel valves, hardened valve seats, and reinforced rocker arms** to handle the demands of high-RPM operation and aggressive tuning.

Whether used in a **restoration project for a classic 911 or 956/957**, a **modern Panamera 951 conversion**, or a **high-performance street machine**, this cylinder head delivers the authenticity and performance expected from Porsche. Its **OEM-level quality** ensures compatibility with original engine mounts, timing components, and supporting systems, making it an ideal choice for enthusiasts seeking to preserve or enhance the mechanical integrity of their Porsche. Built to exacting specifications, this component embodies the precision, durability, and racing pedigree that have made Porsche engines legendary in motorsport and on the road.

### **Pros and Cons of Buying a Porsche 911 (991.2/992) 3.6L (Type 991.2/992) with a Left-Hand Drive (LHD) Cylinder Head (Panamera 3.6L Rebuild Kit)**

#### **Pros**

1. **Performance and Power**

The 3.6L flat-six engine in the 991.2 and 992 911 models is a refined, high-revving powerplant capable of producing **400 horsepower** (depending on tuning and modifications). It offers a smooth, linear power delivery with strong mid-to-high RPM performance, making it ideal for track use and spirited driving.

2. **Proven Reliability (When Maintained Properly)**

The 3.6L engine is a mature design, having been used in the Panamera (916) and Cayenne (C2) before being adapted for the 911. With proper maintenance, it can last **200,000 miles** without major issues. The **991.2 (2015-2019) and 992 (2019-present) versions** incorporate improvements over earlier models, including better fuel injection and cooling systems.

3. **Aftermarket Support and Tuning Potential**

- **Cold air intakes** (improved airflow)

- **High-flow cat-back exhausts** (better sound and slight power gains)

- **Tuning solutions** (e.g., **Porsche Tuning, JB4, or custom ECU flashing**) that can push power to **450-500 HP** with minimal risk if done correctly.

- **Forced induction options** (turbo or supercharger kits exist but are more complex and expensive).

4. **Panamera 3.6L Cylinder Head Rebuild Kit Advantages**

- **Higher Compression & Performance Potential** The Panamera 3.6L cylinder head is designed for **higher compression (11.5:1 vs. 911 s 10.5:1)**, allowing for better power output when tuned.

- **Better Cooling & Durability** The Panamera head features **improved valve springs and cooling passages**, reducing the risk of valve float and overheating under heavy loads.

- **Easier to Modify** The Panamera head is **more forgiving to forced induction** (turbo/supercharger) due to its stronger construction.

- **Resale Value & Prestige** Installing a Panamera head (even with a 911 engine) can **increase the car s perceived value** among enthusiasts and make it more desirable for future buyers.

5. **Track and High-Performance Use**

The 3.6L engine is well-suited for **track days and autocrossing** due to its **strong mid-range torque** and **high-revving nature**. With proper tuning, it can handle **lateral G-forces** better than the older 3.4L or 3.8L engines.

6. **Cost-Effective Upgrade Over Stock 911 Engines**

- The **stock 911 3.6L engine** (9A1/9A2) is already a good performer, but the Panamera head upgrade can **extend its lifespan and improve power output** without requiring a full engine swap.

- Compared to **turbocharged 992 engines (3.0T)**, the NA 3.6L is **cheaper to maintain** and **more reliable** in high-mileage applications.

7. **Aesthetic and Customization Appeal**

- The **991.2 and 992 911s** are already iconic, and modifying them with a **Panamera 3.6L head** can make them stand out in a crowd.

- The **smooth, high-revving sound** of the 3.6L is highly desirable among Porsche enthusiasts.

---

#### **Cons**

1. **Higher Maintenance Costs Than Stock 911 Engines**

- **More frequent oil changes** (every **5,000-7,500 miles** with synthetic oil).

- **Cooling system flushes** (every **30,000-50,000 miles** to prevent corrosion).

- **Valvetrain adjustments** (if running high RPMs or forced induction).

- **Panamera head rebuilds are expensive** ( $3,000-$5,000 installed), which can be a significant upfront cost.

2. **Potential for Overheating (If Not Properly Modified)**

- The **911 s stock cooling system** is not always sufficient for **high-power builds**, especially with a Panamera head and forced induction.

- **Thermostat failures** (leading to overheating).

- **Water pump wear** (especially in high-mileage cars).

- **Inadequate radiator size** for aggressive tuning.

- **Solution:** Upgrading to a **larger radiator, electric fan, or liquid cooling** is often necessary for **400 HP builds**.

3. **Complexity of Forced Induction (If Pursuing Turbo/Supercharger)**

- **Intercoolers** (to prevent charge cooling issues).

- **Upgraded fuel system** (high-flow injectors, upgraded fuel pump).

- **Exhaust manifold upgrades** (to handle higher backpressure).

- **ECU tuning** (to prevent detonation and ensure proper fueling).

- **Mistakes in forced induction builds can lead to engine damage**, so **experience is crucial**.

4. **Weight and Drivability Trade-offs**

- The **911 is already heavy**, and adding a **Panamera head (which is slightly heavier than the stock 911 head)** may **slightly reduce acceleration** unless power gains outweigh the weight.

- Some drivers prefer the **softer, more linear power delivery of the stock 3.6L** over the **high-revving, peaky nature** of the Panamera head when heavily tuned.

5. **Depreciation and Market Perception**

- **Stock 911 3.6L engines** (even in high-mileage condition) **hold value well**, but **modified versions (especially with Panamera heads) may depreciate faster** unless they are **well-documented and professionally built**.

- **Insurance costs** may increase due to **higher power output** (especially if tuned above stock).

6. **Potential for Valvetrain Issues at High RPMs**

- **Valve float can occur at very high RPMs** (above **7,500 RPM**).

- **Retaining ring failures** can happen if the engine is **over-revved or mistuned**.

- **Solution:** Upgrading to **stiffer valve springs or a Panamera valvetrain** can mitigate this.

7. **Not a "Set-and-Forget" Engine**

- Unlike **turbocharged engines (3.0T)**, the **3.6L NA engine requires more attention** to **fuel quality, cooling, and maintenance** to avoid long-term issues.

- **Carbon buildup** can be an issue if the car is **not driven frequently or tuned aggressively**.

---

### **Ending Conclusion**

**High performance** (400 HP with tuning).

**Track and spirited driving** (strong mid-range torque).

**Long-term reliability** (if maintained properly).

**Customization potential** (aftermarket support, forced induction options).

**Aesthetic appeal** (unique modification for 911 owners).

**Higher maintenance costs** (oil changes, cooling system care).

**Careful tuning** (to avoid overheating or valvetrain issues).

**Potential for depreciation** if not documented well.

**Additional weight** (compared to stock 911 engines).

If you are **willing to invest time and money into maintenance and tuning**, the **Panamera 3.6L head upgrade is one of the best modifications** for a **991.2 or 992 911**, offering **significant power gains and reliability improvements** over the stock engine.

---

### **Final Recommendation**

**Buy the Porsche 911 (

Details:

This part comes with a 90 day guarantee. SPECIFIC PART NOTES: CYLINDER HEAD,LH,B ,EIW BTP120225 CML121825.

part #: 306 prices

• $256.50-$495.00

specifications cylinderheapar:

• for models: Panamera
• for makes: Porsche
• for years: 2011-2016
• mpn: 306-porsche
• part type: Driver Cylinder Head
• year: 2014
• condition and options: 3.6l, L.
• manufacturer warranty: 90 Day
• ipn: 306-50571
• fitment type: Direct Replacement
• oe spec or performance/custom: Oem Factory Spec
• core charge: No Core Charge

shipping cylinderheapar:

• transit: 3-8 Days
• type: Fixed
• class: Standard
• service: UPS Ground
• cost: $0.00
• carrier: UPS

seller cylinderheapar:

• # reviews: 79926
• rating: 99.8%
• city: Milton, Florida

general cylinderheapar:

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

payments cylinderheapar:

• wallet: Google-pay
• credit card: Diners-club
• other

returns cylinderheapar:

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

offer cylinderheapar:

• availability: In Stock
• options: Ship-to-home
• quantity: 1
• best offers: True
• sold: 0
• started: April 13, 2026

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