1. Cylinder Heads & Parts Engines Components For Sale
  2. sku: 11576898529940711
  3. PORSCHE CAYENNE

PORSCHE 306-50255R Passenger Cylinder Head 4.8L

fits model: Turbo, Cayenne. make: Porsche. year: 2008–2010.

306-50255r Porsche Passenger Cylinder Head 4.8l With Turbo Fits 08-10 Cayenne

( Model: CAYENNE ), ( Part Type: Cylinder Head ), ( Conditions Options: Rh, Cylinder Head, Off And Ready To Go ), ( Genuine Oem: Yes ), ( Ipn: 306-50255r ), ( Placement: Passenger/right ), ( Year: 2009 )

Review PORSCHE Passenger Cylinder Head 4.8l fits CAYENNE TURBO 2008–2010

The **Porsche 997.0 4.8L Turbo (08-10) Cayenne Passenger Cylinder Head (Part #50255R)** is a precision-engineered component designed to deliver the uncompromising performance and reliability expected from a Porsche. This high-performance cylinder head is specifically crafted for the 9A0 4.8-liter twin-turbocharged V8 engine, a powerhouse that propels the Cayenne with exhilarating acceleration and effortless power delivery. Engineered from a lightweight yet durable alloy, the head features a robust construction with integrated intake and exhaust ports optimized for maximum airflow, ensuring peak combustion efficiency and optimal power output. The design incorporates advanced valve train components, including high-performance valves, precision-machined valve seats, and a robust rocker arm system, all of which contribute to the engine s responsiveness and longevity. This cylinder head is equipped with dual overhead camshafts, each driving a set of valves via pushrods and rocker arms, allowing for precise valve timing and enhanced breathing capacity critical for maintaining the engine s turbocharged performance. The head also includes a sophisticated cooling system with integrated passages to dissipate heat efficiently, preventing thermal stress and ensuring consistent performance under demanding conditions. Whether used in a restoration project or as a replacement for wear and tear, this cylinder head is a critical component that upholds the Cayenne s reputation for power, precision, and driving enjoyment. Built to Porsche s exacting standards, it is a direct-fit solution that guarantees compatibility with the 08-10 Cayenne s 4.8L turbocharged V8, delivering the performance and reliability that enthusiasts and professionals demand.

### **Pros and Cons of Buying a Porsche 306-50255R Passenger Cylinder Head for a 4.8L Turbo (08-10 Cayenne)**

#### **Pros:**

1. **Performance Improvement** The 306-50255R is a high-performance cylinder head designed for increased airflow and power output. It is optimized for the 4.8L turbocharged V8 engine, which can provide noticeable gains in horsepower and torque compared to the stock head.

2. **Better Turbocharging Efficiency** The revised porting and valve sizes in this head improve scavenging and charging efficiency, allowing the turbo to spool faster and maintain higher boost levels without excessive lag.

3. **Durability and Strength** Porsche s high-performance cylinder heads are built with stronger materials and improved cooling passages, reducing the risk of warping or overheating under heavy loads.

4. **Compatibility with Modifications** If you plan to further modify your engine (e.g., forced induction upgrades, camshafts, or fueling adjustments), this head is a solid foundation for those changes.

5. **Resale Value of Upgraded Engine** A well-maintained turbocharged Cayenne with performance upgrades can hold or even increase in value, especially if it s kept in good condition.

6. **Reduced Risk of Detonation** The improved airflow and cooling help mitigate the risk of knock, allowing for slightly more aggressive tuning without damaging the engine.

7. **Porsche-Specific Support** Since this is an official Porsche part (or a high-quality aftermarket equivalent), you can rely on dealer or specialist support if issues arise.

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#### **Cons:**

1. **High Cost** The 306-50255R is not a cheap part. Depending on whether it s new or used, it can cost several thousand dollars, especially if sourced from Porsche or a reputable aftermarket supplier.

2. **Installation Complexity** Replacing a cylinder head requires significant mechanical skill, time, and specialized tools. If you re not experienced with engine work, labor costs at a shop can add up quickly.

3. **Potential for Overkill** If your Cayenne is not heavily modified or used for track use, the gains from this head may not be significant enough to justify the expense. Stock heads are already robust for daily driving.

4. **Compatibility Issues** Ensure the head is fully compatible with your specific engine build (e.g., fueling, ECU tuning, and turbo matching). Mismatches can lead to poor performance or engine damage.

5. **Maintenance Requirements** A high-performance head may require more frequent inspections for valve train wear, oil consumption, or cooling system checks to prevent long-term issues.

6. **Risk of Voiding Warranty** If your Cayenne is under warranty, modifying the engine (especially with aftermarket parts) could void coverage, leaving you responsible for future repairs.

7. **Time Off the Road** A cylinder head swap is a major job that can take days or even weeks, depending on labor availability and engine condition.

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### **Conclusion:**

The **306-50255R passenger cylinder head** is a substantial upgrade for a 4.8L turbocharged Cayenne, offering meaningful performance gains for those who push their engine hard whether for track use, towing, or aggressive daily driving. However, it is an expensive and labor-intensive modification that may not be necessary for casual drivers.

If you re looking to **maximize power, reduce turbo lag, and improve reliability under heavy loads**, this head is a strong choice. But if your primary goal is **daily comfort and modest performance**, the stock head may suffice, and the cost savings could be better spent elsewhere (e.g., suspension, exhaust, or interior upgrades).

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### **Recommendation:** - **Proceed with the upgrade if:**

- You plan to **tune the engine aggressively** (e.g., 600 HP builds).

- You **race or track drive** regularly and need every bit of power and reliability.

- You re **already investing in other major modifications** (e.g., turbo, fueling, exhaust) and want a complete performance package.

- You have **mechanical experience** or are working with a **trusted Porsche specialist**.

- **Avoid or reconsider if:**

- You re on a **tight budget** and the gains don t justify the cost.

- Your Cayenne is **mostly a daily driver** with minimal performance demands.

- You re **not prepared for the labor and downtime** required for installation.

- You **value warranty coverage** and are uncomfortable voiding it for an upgrade.

For those on the fence, consider **testing the stock head s limits first** with a tune or minor upgrades before committing to a full cylinder head swap. If you decide to move forward, ensure you pair it with **proper fueling, cooling, and ECU support** to avoid engine stress.

Details:

Body parts are sold as is. PORSCHE CAYENNE 08-10 4.8L, w/turbo engine, R.

part #: 306-50255r prices

  • $750.00-$1036.00

specifications cylinderheapar:

  • for models: Turbo, Cayenne
  • for makes: Porsche
  • for years: 2008-2010
  • model: Cayenne
  • part type: Cylinder Head
  • conditions options: Rh, Cylinder Head, Off And Ready To Go
  • genuine oem: Yes
  • ipn: 306-50255r
  • placement: Passenger/right
  • year: 2009

seller cylinderheapar:

  • city: Taylor, Michigan
  • # reviews: 1186
  • rating: 95.6%

general cylinderheapar:

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

returns cylinderheapar:

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

payments cylinderheapar:

  • wallet: Paypal
  • credit card: Discover
  • other

offer cylinderheapar:

  • started: February 21, 2026
  • options: Ship-to-home
  • quantity: 1
  • sold: 0
  • availability: In Stock

shipping cylinderheapar:

  • carrier: UPS
  • class: Standard
  • transit: 3-6 Days
  • service: UPS Ground
  • cost: $164.61
  • type: Calculated
for models: turbo, cayenne, for makes: porsche, for years: 2008-2010, part type: cylinder head, conditions options: rh, cylinder head, off and ready to go, genuine oem: yes, placement: passenger/right, year: 2009,
manufacturer: porsche, category: auto parts > car truck parts accessories > engines engine parts > cylinder heads, sku: 11576898529940711,
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2 offers $750.00–$1036.00 USD
  • Used. Offer #1 priced at $1036.00 + $164.61 shipping estimate = $1200.61* total. RH,CYLINDER HEAD,OFF AND READY TO GO PORSCHE CAYENNE 08-10 4.8L, w/turbo (engine), R.+$164.61 shipping
  • Used. Offer #2 priced at $750.00 + $0.00 shipping estimate = $750.00* total. 4.8L TURBO.FREE SHIPPING

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