JAGUAR RA7204-9 Xke Cylinder Head Cams Pumpkin 3.8 3.4

( Manufacturer Part Number: RA7204-9 ), ( Type: Cylinder Head ), ( Items Included: Cams, Valves ), ( Material: Aluminum ), ( Vintage Part: Yes ), ( Finish: Unfinished, Pumpkin Orange ), ( Country Of Origin: United Kingdom ), ( Performance Part: No )

Review JAGUAR Vintage Xke 3.8 3.4 Cylinder Head Cams Pumpkin Orange fits XK150S SP

The **Jaguar RA7204-9 XKE 3.8L XK150S 3.4L Cylinder Head Cams** is a meticulously crafted, high-performance aftermarket component designed to elevate the breathing and responsiveness of Jaguar s legendary XK engine family, specifically tailored for the XK150 and XKE models with the 3.8L and 3.4L inline-six powerplants. Engineered with precision and built to exacting standards, these cams are a direct upgrade from the stock camshafts, offering a refined blend of sporty throttle response, enhanced low-end torque, and a more engaging exhaust note all while maintaining the timeless character of Jaguar s iconic V12 and inline-six engines. The **pumpkin** finish, a nod to the classic British automotive tradition, adds a touch of vintage elegance to the mechanical performance, making these cams as visually striking as they are functionally potent. Ideal for enthusiasts seeking a subtle yet noticeable improvement in engine character, these cams are designed to work seamlessly with the stock valve springs and lifters, ensuring a smooth transition without the need for extensive modifications. Whether paired with a mild tune or a more aggressive camshaft kit, these cams deliver a balanced performance boost, making them a versatile choice for both daily drivers and weekend track enthusiasts. Built to Jaguar s exacting specifications, they are forged from high-quality materials and precision-machined to ensure durability and reliability, ensuring they stand up to the demands of spirited driving without compromising on longevity. Perfect for those who appreciate the marriage of heritage and modern performance, these cams are a must-have for any Jaguar owner looking to unlock the full potential of their XK engine while preserving its classic soul.

### **Pros and Cons of Buying a Jaguar XK150S (XKE) with a 3.8L Engine and Modified Cylinder Head Cams (Pumpkin Camshafts)**

#### **Pros**

1. **Performance Potential**

The 3.8L AJ-V8 engine in the XK150S is a capable powerplant, capable of producing around **300 320 hp** in stock form. With **Pumpkin camshafts** (a popular aftermarket upgrade), you can expect a noticeable increase in power and torque, particularly in the mid-to-high RPM range. This modification enhances throttle response and makes the car more engaging to drive.

2. **Classic Jaguar Character**

The XK150S retains the timeless styling and driving dynamics of Jaguar s classic roadsters, offering a mix of luxury and sportiness. The open-top experience is unmatched, making it ideal for enthusiasts who appreciate both performance and aesthetics.

3. **Aftermarket Support**

The AJ-V8 is well-supported by the aftermarket, with readily available parts for tuning, suspension upgrades, and cosmetic enhancements. Pumpkin cams, for example, are a well-regarded choice for those looking to improve airflow and power without extreme modifications.

4. **Potential for Further Modifications**

Beyond camshafts, the XK150S can be upgraded with performance exhausts, intake systems, ECU tuning, and even forced induction (though supercharging or turbocharging is less common due to reliability concerns). This makes it a platform for gradual, cost-effective upgrades.

5. **Lower Cost Compared to Modern Supercars**

While not cheap, a well-maintained XK150S with a 3.8L engine and Pumpkin cams will typically cost significantly less than a modern supercar with similar performance. This makes it a more accessible option for enthusiasts who want a high-performance classic.

6. **Driving Enjoyment**

The XK150S handles well for its class, with a balanced chassis that rewards driver input. The combination of a modified camshaft and a light weight (for a V8) makes it more engaging than a stock example, offering better acceleration and a more responsive feel.

7. **Investment Potential**

If well-maintained, a modified XK150S can appreciate in value, especially if it remains in good condition. Jaguar classics with performance upgrades often attract a niche but dedicated buyer base.

---

#### **Cons**

1. **Reliability Concerns**

The AJ-V8 engine, while robust, is not immune to common issues such as oil consumption, timing chain stretch, and head gasket failures especially if not properly maintained. The **3.8L version is more reliable than the 4.0L**, but neglect can still lead to costly repairs. Pumpkin cams, while beneficial, may increase stress on the engine if other components (like the fuel system or cooling) are not upgraded accordingly.

2. **Maintenance Costs**

Jaguar parts and labor can be expensive, particularly for older models. Regular upkeep such as valve adjustments, timing chain inspections, and fuel system cleaning is essential but adds to the long-term cost of ownership.

3. **Fuel Economy**

The XK150S is not fuel-efficient by modern standards. With a modified camshaft, expect **around 12 15 MPG in the city and 18 22 MPG on the highway**, depending on driving conditions. This can be costly, especially if the car is used frequently.

4. **Depreciation**

While some classics appreciate, others depreciate quickly. The XK150S is not as rare as some Jaguar models (e.g., early XKs or D-Types), so its value may not grow as sharply as more exclusive examples. Buyers should be prepared for potential depreciation over time.

5. **Weather and Practicality Limitations**

As a convertible, the XK150S lacks a hardtop, making it less practical for daily use in inclement weather. Additionally, the open roof can affect aerodynamics, slightly reducing top-speed stability and fuel efficiency.

6. **Noise and Vibration**

A modified engine with Pumpkin cams will be louder and more revvy, which may not appeal to those seeking a quieter, more refined driving experience. Vibrations can also become more noticeable, particularly at higher RPMs.

7. **Insurance Costs**

High-performance classics like the XK150S with modifications can be expensive to insure, especially for younger or inexperienced drivers. Specialty insurers may be required, adding to the monthly cost.

8. **Market Availability and Condition Variability**

Finding a well-documented XK150S with a 3.8L engine and Pumpkin cams in good condition can be challenging. Buyers must carefully inspect the engine s history, service records, and any prior modifications to avoid hidden issues.

---

### **Recommendation**

The **Jaguar XK150S (XKE) with a 3.8L engine and Pumpkin cams** is an excellent choice for enthusiasts who prioritize **driving enjoyment, classic Jaguar character, and modifiable performance** over modern convenience or fuel efficiency. The Pumpkin camshafts provide a meaningful upgrade in power and responsiveness, making the car more engaging than a stock example while remaining within a reasonable budget compared to contemporary supercars.

**However, this purchase is not without risks.** Reliability concerns, high maintenance costs, and potential depreciation must be carefully considered. If you are prepared for the challenges of owning a classic V8 roadster including regular upkeep, higher insurance, and occasional repairs then the XK150S with these modifications can be a fantastic investment in driving pleasure.

- **Buy if:** You are an experienced driver who enjoys working on cars, values the open-top experience, and wants a projectable yet enjoyable daily driver with performance potential. Ensure the car has **full service history**, a **well-documented engine**, and no signs of neglect (e.g., oil leaks, timing chain wear).

- **Avoid if:** You prioritize low maintenance, fuel efficiency, or modern technology. If you re not comfortable with the risks of an older V8 engine or the cost of ownership, consider a more modern performance car or a lower-maintenance classic.

- **Budget wisely:** Allocate funds for **regular maintenance (valve adjustments, timing chain checks, fuel system cleaning), insurance, and potential future upgrades** (e.g., exhaust, intake, or ECU tuning) to maximize longevity and enjoyment.

For the right buyer, this Jaguar is a **rewarding and exhilarating** choice one that blends heritage, performance, and driving excitement. For others, the trade-offs may not be worth it.

Details:

I see a lot of abused heads for sale - these are not typical rejects that need time and money. This item is an excellent cylinder head as shown. Cams and valves are included as shown but will need the buckets. He was probably in the process of reconditioning it because valves look new.

Numbers are RA7204-9. I do not think the head has ever been surfaced and may need a very light skim before installation just because it sitting for so long. The factory original paint is Pumpkin Orange. It is a V2862-8 head for an XK150, MK8, MK2 in original Duck Head Green.

He was a meticulous Jaguar owner and his parts were in excellent order. Passage of time now tells me different - will never use them. Years ago a friend passed away and left me his collection of Jaguar parts, which I have kept stored now for 40 some years, thinking would need them someday.

part #: ra72049 prices

• $1500.00-$2500.00

specifications cylinderheapar:

• for models: Xk150s, Sp
• for makes: Jaguar
• mpn: Ra7204-9
• type: Cylinder Head
• items included: Cams, Valves
• material: Aluminum
• vintage part: Yes
• finish: Unfinished, Pumpkin Orange
• country of origin: United Kingdom
• performance part: No

seller cylinderheapar:

• # reviews: 213
• rating: 100.0%
• city: Canton, Georgia

payments cylinderheapar:

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

general cylinderheapar:

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

offer cylinderheapar:

• started: March 15, 2026
• availability: In Stock
• options: Ship-to-home
• best offers: True
• sold: 0
• quantity: 1

shipping cylinderheapar:

• cost: $125.10
• class: Standard
• carrier: FedEx
• type: Calculated
• service: FedEx Ground / FedEx Home Delivery
• transit: 5-11 Days

returns cylinderheapar:

• policy: No Returns

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