FORD M-6049-T46 Racing High Flow Left Head Dohc FR500 4.6

( Manufacturer Part Number: M-6049-T46 ), ( Type: Cylinder Head ), ( Material: Aluminum ), ( Vintage Part: No )

Review FORD Racing High Flow Left Side Head Used 4.6 Dohc

The **Ford M-6049-T46 Racing High-Flow FR500 Left-Hand Head for 4.6L DOHC Engines** is a meticulously engineered aftermarket component designed to elevate the performance of Ford s iconic 4.6-liter Dual Overhead Cam (DOHC) V8 engines, commonly found in vehicles like the Mustang GT, SVT Cobra, and F-150 Raptor. Crafted from premium, high-grade aluminum alloy, this FR500 head is built to withstand the rigors of high-performance applications while delivering exceptional airflow and combustion efficiency. The head features a **fully balanced, high-flow design** with optimized port geometry, ensuring maximum intake and exhaust flow rates to enhance horsepower and torque output. Its **left-hand orientation** is ideal for applications where the engine bay layout requires a left-side cylinder head, such as certain Mustang GT builds or custom engine swaps. The FR500 head incorporates **precision-machined combustion chambers** and **high-lift camshaft-compatible valve springs**, allowing for aggressive valve lift and duration to improve breathing at high RPMs. Additionally, it is compatible with **high-flow intake and exhaust systems**, making it a seamless upgrade for forced-induction setups, including turbocharged or supercharged applications. Built to meet or exceed OEM specifications, this head is often paired with **stainless steel valves, hardened valve seats, and upgraded valve guides** to ensure durability under extreme conditions. Whether used in a street-legal performance build, a drag racing application, or a high-revving engine swap, the M-6049-T46 FR500 head provides the foundation for a more responsive and powerful 4.6L engine, making it a must-have component for enthusiasts seeking to unlock the full potential of Ford s legendary V8.

The **Ford M-6049-T46 Racing High-Flow FR500 Left-Head 4.6L DOHC** is a performance intake manifold designed for high-performance applications, particularly in Ford 4.6L (Modular) engines with dual overhead camshafts (DOHC). Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **High Flow Design**

The FR500 manifold is engineered to maximize airflow into the engine, reducing intake restriction and improving horsepower and torque. This is particularly beneficial for forced induction applications (turbocharged or supercharged) and high-RPM performance builds.

2. **Left-Head Compatibility**

It is specifically designed for the left-hand bank of a 4.6L DOHC engine (common in the 1997 2010 Ford Mustangs, SVT Cobra, and other applications). This ensures proper fitment and alignment with the engine s internals, avoiding leaks or misalignment issues.

3. **Durable Construction**

The manifold is typically made from high-quality materials, such as billet aluminum or cast aluminum, which are resistant to warping and corrosion. This ensures longevity, especially under high-performance conditions.

4. **Performance Gains**

When paired with a high-flow throttle body, intake, and exhaust system, the FR500 can deliver noticeable power gains, especially in the mid-to-high RPM range. This makes it a popular choice for street and track applications.

5. **Easy Installation**

The manifold is designed for straightforward installation, often requiring only basic tools. It is typically a direct drop-in replacement for the stock manifold, though some modifications (like porting or swapping throttle bodies) may be needed for optimal results.

6. **Compatibility with Aftermarket Parts**

The FR500 works well with a variety of aftermarket components, including high-flow throttle bodies (e.g., Holley, Edelbrock), performance intakes, and forced induction systems. This flexibility allows for customization based on specific tuning goals.

7. **Proven Track Record**

The M-6049-T46 is a well-established product in the performance community, with many users reporting reliable performance gains. It is often recommended by tuners and builders for 4.6L applications.

---

### **Cons**

1. **Cost**

The FR500 is not a budget-friendly option. Prices typically range from **$300 to $600**, depending on the seller and whether it includes additional components (e.g., gaskets, hardware). This can be a significant investment for enthusiasts on a tighter budget.

2. **Requires Supporting Modifications**

- A high-flow throttle body (e.g., 850 1050 cfm)

- Performance intake (e.g., K&N, AEM)

- Exhaust system with larger headers or a cat-back system

- Tuning (ECU reprogramming or standalone tune)

Without these, the gains may be modest, and the engine could run rich or suffer from poor throttle response.

3. **Potential for Leaks**

Like any high-performance intake manifold, the FR500 can develop leaks at the gaskets or bolts, especially under high boost or aggressive driving conditions. Proper installation and regular inspection are necessary to prevent vacuum leaks, which can cause rough idle, hesitation, or reduced power.

4. **Limited Stock Fitment**

While it fits the left head of a 4.6L DOHC engine, it does not include a right-hand manifold. If you need a full intake solution, you ll need to pair it with a right-hand manifold (e.g., another FR500 or a different high-flow option like the FR500-R for the right side).

5. **Not Ideal for Naturally Aspirated Stock Engines**

For a stock 4.6L engine running naturally (without forced induction), the gains from the FR500 may be minimal. It is best suited for engines with forced induction or significant tuning, where airflow is a limiting factor.

6. **Potential for Voids or Defects**

As with any aftermarket part, there is a risk of receiving a defective or poorly manufactured unit. Buying from a reputable seller (e.g., JEGS, Summit Racing, or a trusted local shop) can mitigate this risk, but it s still a consideration.

7. **Installation Challenges**

While generally straightforward, installation may require some mechanical skill, especially if the engine bay is tight or if additional modifications (like swapping throttle bodies) are involved. Improper installation can lead to leaks or performance issues.

---

### **Conclusion**

The **Ford M-6049-T46 Racing High-Flow FR500 Left-Head 4.6L DOHC** is a high-quality, performance-focused intake manifold that delivers measurable gains in airflow and power for 4.6L DOHC engines, particularly when paired with forced induction or supporting modifications. Its durable construction, easy installation, and compatibility with aftermarket parts make it a strong choice for enthusiasts looking to push their engine s limits.

However, the cost, requirement for complementary upgrades, and potential for leaks or installation challenges mean it is not a "plug-and-play" solution. It is best suited for builders who are already investing in a performance package (e.g., turbocharger, throttle body, tune) and want to further optimize airflow. For naturally aspirated stock engines or those on a tight budget, the gains may not justify the expense.

---

### **Recommendation**

- You are running a **turbocharged or supercharged 4.6L DOHC engine** and need a high-flow intake manifold to support the increased airflow demands.

- You are already investing in **complementary performance parts** (e.g., high-flow throttle body, intake, exhaust, tune) and want to maximize power output.

- You prioritize **durability and airflow improvements** over cost savings.

- You have **basic mechanical skills** or access to a mechanic for installation.

- You are on a **tight budget** and cannot afford additional supporting modifications.

- Your engine is **naturally aspirated and stock**, as the gains may be negligible.

- You are not comfortable with **installation or potential leaks**, as improper setup can lead to performance issues.

- You need a **full intake solution** (both left and right manifolds) and are not prepared to source a right-hand manifold separately.

**Final Verdict:** The FR500 is a **solid choice for high-performance 4.6L applications**, but it is most effective as part of a broader performance build. If you are serious about tuning your engine, it is a worthwhile investment. For casual or budget-conscious builders, prioritize other upgrades first. Always pair it with a **standalone tune or ECU reprogramming** to ensure optimal performance and prevent engine damage.

Details:

The FR500 heads is the only aftermarket performance head made for 4v 4.6. Head is used but in great condition. These heads flow approximately 20% more on the intake and 15% exhaust than a stock production head. Check my other listings for a right side head I have couple listed.

Used Ford racing high flow FR 500 head.

part #: m6049t46 prices

• $89.99-$168.31

specifications cylinderheapar:

• for makes: Ford
• mpn: M-6049-t46
• type: Cylinder Head
• material: Aluminum
• vintage part: No

returns cylinderheapar:

• policy: No Returns

shipping cylinderheapar:

• class: Standard
• transit: 5-10 Days
• cost: $50.00
• service: UPS Ground
• type: Fixed
• carrier: UPS

offer cylinderheapar:

• availability: In Stock
• best offers: True
• options: Ship-to-home
• started: May 2, 2026
• sold: 0
• quantity: 1

payments cylinderheapar:

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

general cylinderheapar:

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

seller cylinderheapar:

• rating: 95.0%
• # reviews: 111
• city: Pepperell, Massachusetts

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