PORSCHE 99310403544 Cylinder Head Rs M64.20 993.104.295.6R

( Manufacturer Part Number: 99310403544 ), ( Part Type: Cylinder Head ), ( Country Of Origin: Germany )

Review PORSCHE 993 Rs Cylinder Head fits CARRERA 6R 911 1995–1996

The **Porsche 993.104.295.6R cylinder head** for the **1995-1996 911 Carrera M64 (993)** is a meticulously engineered component designed to deliver the uncompromising performance and reliability that define Porsche s legendary 911 lineup. This forged aluminum head, identified by its **993.104.295.6R** part number, is a critical element of the **M64 3.6-liter flat-six engine**, renowned for its precision machining and high-strength construction. Crafted from a single billet of 7075-T6 aluminum alloy, it features a **six-bolt main cap design** and **integrated intake and exhaust ports** that optimize airflow while maintaining structural integrity under extreme power outputs. The **6R variant** denotes a revised version of the original M64 head, incorporating subtle refinements such as improved valve seat inserts and optimized combustion chamber geometry to enhance efficiency and reduce detonation risk, particularly at higher RPM ranges. This head is compatible with both **naturally aspirated (NA) and mildly turbocharged applications**, making it a versatile choice for enthusiasts seeking to preserve or restore the stock character of their 993 Carrera while accommodating aftermarket modifications. The **993.104.295.6R** stands out for its **precision-machined valve guides and hardened valve seats**, which ensure longevity and consistent performance even under aggressive tuning scenarios. Whether used in a fully restored M64 engine or as part of a high-performance rebuild, this cylinder head embodies Porsche s commitment to engineering excellence, offering a perfect blend of heritage and modern reliability for the discerning owner of a 911 Carrera.

### **Pros and Cons of Buying a 1995-1996 Porsche 911 Carrera (993, M64, 2.7L, 6-Cylinder, 993.104.295.6R)**

#### **Pros**

1. **Classic 993 Design and Build Quality**

The 993 is widely regarded as one of Porsche s most refined and well-built 911 models. Its timeless design, solid construction, and attention to detail make it a desirable collector s item. The body structure is robust, and the chassis is well-proven, offering a balance between performance and comfort.

2. **Reliable 6-Cylinder Engine (M64)**

The 2.7L flat-six engine in the Carrera is a refined powerplant compared to the earlier 3.6L V8. It produces **250 hp (SAE gross)** and **236 lb-ft of torque**, delivering smooth acceleration and a linear power delivery. The M64 is known for its durability, especially when maintained properly. With proper care, it can easily exceed **200,000 miles** without major issues.

3. **Mechanical Simplicity and Ease of Maintenance**

Unlike the more complex V8 models, the 6-cylinder Carrera has fewer moving parts, making it easier and cheaper to maintain. Common issues like water pump failures, oil leaks, and suspension wear are manageable with basic mechanical knowledge. Porsche s service records (if available) can help track maintenance history.

4. **Excellent Driving Dynamics**

The 993 s weight distribution (50/50) and rear-wheel-drive layout provide outstanding handling. The Carrera s **PDK-like manual transmission (if equipped)** or standard 5-speed manual offers precise gear shifts, and the rear-engine layout ensures a balanced, engaging driving experience. The **Wetrak suspension** (on later models) improves comfort and stability.

5. **Strong Secondary Market and Appreciation Potential**

The 993 has seen steady appreciation, especially for well-documented examples. A **Carrera 6 (M64)** in good condition is a solid investment, particularly if it has a **low mileage (under 50,000 miles) or original condition**. Restomods and classic car demand continue to drive up values.

6. **Lower Running Costs Compared to V8 Models**

Fuel efficiency is better than the V8 (around **16-18 MPG highway**), and the 6-cylinder requires less oil and has fewer high-cost components (e.g., no intercooler, simpler turbo setup). Parts are widely available, and labor costs are reasonable compared to modern Porsches.

7. **Customization Potential**

The 993 is a favorite for restomod projects. Owners can easily upgrade suspension (Eibach, Bilstein), exhaust (Borla, Akrapovic), brakes (Brembo), and interior (Nardi, Recaro). Engine modifications (turbocharging, camshaft upgrades) are also popular but should be done carefully to avoid voiding insurance or warranty concerns.

8. **Sound and Character**

The M64 s exhaust note is deep and throaty, with a distinct **two-tone turbocharger whine** that enthusiasts appreciate. The engine bay is spacious, and the manual transmission (if present) provides a satisfying driving experience.

9. **Lower Insurance Costs Than V8 or Later Models**

Compared to a 996 or 997, insurance for a 911 Carrera 6 is more affordable, making it a practical daily driver for those who want a Porsche without exorbitant premiums.

10. **Community and Support**

The 993 has a strong owner community, with forums (e.g., **911Club.com, Porsche 993 Owners Group**) offering troubleshooting, parts sourcing, and restoration advice. Many mechanics specialize in 993s, making repairs more accessible.

---

#### **Cons**

1. **Turbocharger Reliability Concerns**

The M64 s **turbocharger (Garrett T25)** is a known weak point. Common issues include **wastegate failures, oil leaks, and turbo spin-up problems**, which can lead to **catastrophic engine damage** if ignored. Regular **turbo inspections and upgrades** (e.g., aftermarket turbos like **Garrett T28/T3**) are recommended.

2. **Water Pump Failures**

The **plastic water pump** (common in early 993s) is prone to cracking, leading to **coolant leaks and overheating**. Replacing it with a **metal pump** (e.g., **Porsche 993.104.295.6R or aftermarket**) is a critical maintenance step.

3. **Oil Leaks and Seals**

The **oil filter housing gasket, valve cover gasket, and rear main seal** are frequent leak points. These are relatively easy to fix but require **regular inspections**, especially if the car sits for extended periods.

4. **Suspension Wear**

The **shock absorbers, bushings, and sway bars** wear out over time, leading to **poor handling and a rough ride**. Upgrading to **Eibach springs or Bilstein B8** can improve performance but may reduce comfort.

5. **Electrical Gremlins**

The 993 s electrical system can be finicky, with issues like **faulty sensors, intermittent wiring problems, and dashboard glitches**. The **fuel injection system** (Bosch LE-Jetronic) can develop **vacuum leaks or sensor failures**, requiring occasional tuning.

6. **Transmission Issues (If Automatic)**

The **993 s automatic transmission (if equipped)** is less common and more prone to **slippage, delayed shifts, and fluid degradation**. A **manual transmission (if available)** is generally more reliable.

7. **Rust and Bodywork Concerns**

Some 993s, especially those from **salted climates (Canada, Northern Europe)**, suffer from **underbody rust**. Inspect the **rockers, sills, and rear quarter panels** thoroughly before purchasing. A **full undercoating and rust treatment** may be needed.

8. **Limited Power Compared to Modern Standards**

At **250 hp**, the Carrera 6 is **lapped by modern turbocharged Porsches**. While it s quick for its class (0-60 in 5.5-6.0 sec), it lacks the **raw acceleration** of a 996 Turbo or 997 GT3. However, this is part of its charm for purists.

9. **High Maintenance Costs Over Time**

While cheaper than a V8, the **M64 still requires regular upkeep** (turbo work, suspension refreshes, electrical tweaks). A **well-documented car with a budget for maintenance** is ideal.

10. **Insurance and Theft Risks**

Despite being older, the 911 Carrera 6 is still a **target for theft** due to its value. **Alarm systems and tracking devices** are recommended. Insurance can be **moderate but not excessive** compared to newer Porsches.

---

### **Conclusion**

The **1995-1996 Porsche 911 Carrera (993, M64, 6-cylinder)** is a **fantastic choice** for those who appreciate **classic Porsche engineering, driving pleasure, and long-term potential**. It strikes a **balance between performance, reliability, and affordability** compared to V8 models or later 911 generations.

- Enthusiasts who want a **daily driver with Porsche character** without the complexity of a V8.

- Investors looking for a **well-documented, low-mileage example** with appreciation potential.

- Owners who enjoy **restomoding or mechanical projects** and are willing to maintain the car properly.

- Those who prefer **manual transmission** (if available) for a more engaging driving experience.

- **Turbo and water pump reliability** require **proactive maintenance**.

- **Electrical and suspension issues** may need **occasional attention**.

- **Rust and bodywork** should be **thoroughly inspected** before purchase.

1. **Turbo and water pump condition** (replace if needed).

2. **Rust inspection** (especially underbody and wheel wells).

3. **Transmission and clutch health** (if manual).

4. **Electrical system functionality** (check sensors, wiring, and dashboard).

5. **Documentation** (service records, original parts, no major accidents).

- **Purchase Price:** $30,000 $60,000 (depending on condition, mileage, and extras like PDK or low miles).

- **Annual Maintenance:** $1,500 $3,000 (including parts and labor).

- **Insurance:** $1,200 $2,500/year (varies by location and coverage).

The **993 Carrera

Details:

1995 1996 Porsche 911 993 Carrera RS M64.20 Cylinder Head 993.104.295.6R, Head.: Part Number: Super session s: 993-104-035-02; ; ; 993-104-035-44.

part #: 99310403544 price

• $500.00

specifications cylinderheapar:

• for models: 6r, 911, Carrera
• for makes: Porsche
• for years: 1995-1996
• mpn: 99310403544
• part type: Cylinder Head
• country of origin: Germany

returns cylinderheapar:

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

general cylinderheapar:

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

shipping cylinderheapar:

• type: Calculated
• transit: 5-10 Days
• cost: $66.54
• carrier: UPS
• class: Standard
• service: UPS Ground

payments cylinderheapar:

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

seller cylinderheapar:

• rating: 98.7%
• # reviews: 231
• city: Rocky Mount, North Carolina

offer cylinderheapar:

• started: March 4, 2026
• availability: In Stock
• sold: 0
• best offers: True
• options: Ship-to-home
• quantity: 1

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