MOPAR P5007904 Performance Raised Port Cylinder Heads Tappet W9 48 Race Block

( Manufacturer Part Number: P5007904 ), ( Fitment Type: Direct Replacement ), ( Genuine Oem: Yes ), ( Material: Aluminum ), ( Type: Cylinder Head ), ( Replaces Part Number: P5007952 ), ( Finish: Unfinished ), ( Country Of Origin: United States )

Review MOPAR Performance W9 Raised Port Cylinder Heads 48 Degree Tappet Bore Race Block

The **Mopar P5007904 Performance W9 Raised Port Cylinder Heads** are a meticulously engineered upgrade designed to transform the breathing efficiency and overall performance of your high-performance small-block Ford engine, particularly when paired with a 48-tappet race block. These heads are crafted from high-quality cast aluminum, featuring a **W9 raised port design**, which significantly enhances airflow by increasing the port volume and optimizing the velocity of intake and exhaust gases. The raised port geometry promotes better scavenging and filling of the combustion chamber, resulting in improved horsepower and torque output, especially under high-RPM conditions. Each head is precision-machined to exacting specifications, ensuring a perfect fit with the 48-tappet race block, which is known for its enhanced durability and structural integrity. The heads incorporate **high-flow intake and exhaust ports** that are carefully contoured to minimize turbulence while maximizing airflow, reducing pumping losses and improving volumetric efficiency. Additionally, these heads are equipped with **high-quality valve seats** and **hardened valve guides** to withstand the rigors of high-performance applications, including forced induction setups. The **raised port design** also allows for better valve angle optimization, reducing the risk of valve-to-port interference and improving overall reliability. Whether you're building a street-street machine, a drag racing engine, or a high-revving supercharged setup, these heads deliver a substantial performance boost while maintaining a balance between power and durability. When paired with a matching intake manifold, camshaft, and fueling system, the P5007904 heads will help unlock the full potential of your 48-tappet race block, delivering a noticeable increase in both top-end power and low-end torque. Built to meet the demands of serious engine builders, these heads are a premium choice for those seeking a significant performance upgrade without compromising on quality or fitment.

### **Pros and Cons of Buying Mopar P5007904 Performance W9 Raised-Port Cylinder Heads for a 48 Tappet Race Block**

1. **Enhanced Performance** The raised-port design improves airflow compared to stock heads, leading to better horsepower and torque, especially in high-RPM applications. This is particularly beneficial for forced induction builds (turbocharged or supercharged) or high-revving naturally aspirated engines.

2. **Durability and Strength** These heads are forged from high-quality materials, making them more resistant to warping and cracking under high heat and stress. The W9 designation suggests they are designed for aggressive applications, including nitrous or extreme boost levels.

3. **Compatibility with Modern Engines** While originally designed for older Mopar engines (like the 318, 360, or 440), these heads can be adapted to a 48-tappet race block with proper machining and valve job modifications. They are a popular choice for crate engine builds and high-performance street/strip applications.

4. **Aftermarket Support** These heads have a strong following in the performance community, meaning parts like valves, springs, retainers, and gaskets are widely available. Tuning support (via software like Haltech or Link) is also well-documented for these heads.

5. **Proven Reliability** Many racers and builders trust these heads for their ability to handle high loads without excessive wear. The raised-port design reduces the risk of valve float at high RPMs, which is critical for drag racing or top-end power.

6. **Cost-Effective Upgrade** Compared to full custom heads or exotic materials (like titanium), these forged steel heads offer a balance of performance and affordability. They are often cheaper than aftermarket alternatives like Edelbrock or JE.

7. **Easy to Modify** The heads can be ported further for additional airflow gains, or they can be used as-is for a straightforward upgrade. They also work well with mild bolt-on modifications like headers and fueling upgrades.

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1. **Weight** Forged steel heads are heavier than aluminum or exotic materials, which can slightly reduce engine responsiveness, especially in high-revving applications. However, this is rarely a significant issue unless building for extreme lightweight applications.

2. **Heat Retention** Steel retains heat better than aluminum, which can lead to slightly higher operating temperatures. This may require a more robust cooling system (e.g., larger radiator, upgraded water pump) to prevent overheating under heavy loads.

3. **Machining Requirements** These heads may need valve reliefs, port matching, or decking to fit a 48-tappet block properly. The block s deck height and valve angle compatibility must be verified to avoid clearance issues with pistons or rods.

4. **Limited Stock Valve Guide Compatibility** The stock valve guides in these heads may not align perfectly with a 48-tappet block s valve angle. Replacing guides or using aftermarket guides (e.g., from ARP or Crane) may be necessary, adding to the cost.

5. **Potential for Leakage** If not properly gasketed or torqued, these heads can leak coolant or oil. High-performance gaskets (like ARP or Fel-Pro) and careful installation are required to prevent this.

6. **Learning Curve for Installation** Swapping heads on a 48-tappet block involves precision work, including valve spring retention, rocker arm setup, and pushrod length adjustments. Inexperienced builders may encounter challenges during installation.

7. **Resale Value** While these heads are popular in the performance market, their resale value may not be as high as stock or lightly modified heads, especially if heavily ported or modified.

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The **Mopar P5007904 W9 raised-port cylinder heads** are an excellent choice for builders targeting **high-performance, high-RPM applications** on a 48-tappet race block. They offer a **proven performance boost**, durability, and compatibility with modern tuning solutions. However, they require **careful installation, potential modifications, and attention to cooling** to fully realize their potential.

For **drag racing, forced induction builds, or aggressive street/strip applications**, these heads are a **strong recommendation**. For **daily drivers or mild performance upgrades**, they may be overkill unless paired with other high-performance components.

If budget allows, pairing these heads with **aftermarket valves, springs, and a proper valve job** will maximize their benefits. Always ensure the **block s deck height and valve angle** are compatible to avoid clearance issues.

- You re building a **high-performance or race engine** (turbocharged, supercharged, or high-RPM NA).

- You re willing to invest in **proper machining, gaskets, and tuning** to support them.

- You want a **proven, durable upgrade** over stock heads.

- You re on a tight budget and can t afford machining or additional components.

- Your application is **low-RPM or mild performance** (stock or mild aftermarket heads may suffice).

- You lack experience with **head swaps or engine modifications**.

For most **serious builders targeting 600 HP**, these heads are a **solid, cost-effective choice** that delivers measurable gains. Just ensure all supporting components (block prep, fueling, cooling) are up to the task.

Details:

This is for a pair. I sometimes make mistakes, but i'm not out to cheat anyone, or sell you something you're 100% happy with. Let me know if there is an issue. 13 Valve Angle.

Those head are un finish and will need to be done. Semi Machined Bare Head. Comes as pics.Fits 48 degree Tappet Bore Race Blocks. I put those as use but they has never been installed.

A if you follow the golden rule, and treat me as would like to be treated, I will do my best make it right by. Chamber Must Be CNC Machined. MOPAR PERFORMANCE W9 RAISED PORT CYLINDER HEADS 48 DEGREE TAPPET BORE RACE BLOCK.

part #: p5007904 prices

• $1167.02-$1582.52

specifications cylinderheapar:

• for makes: Mopar
• mpn: P5007904
• fitment type: Direct Replacement
• genuine oem: Yes
• material: Aluminum
• type: Cylinder Head
• replaces part number: P5007952
• finish: Unfinished
• country of origin: United States

shipping cylinderheapar:

• service: FedEx Ground / FedEx Home Delivery
• cost: $100.00
• carrier: FedEx
• transit: 4-8 Days
• class: Standard
• type: Fixed

seller cylinderheapar:

• rating: 99.9%
• city: Fair Oaks, California
• # reviews: 4663

payments cylinderheapar:

• other
• money order
• wallet: Google-pay
• credit card: Mastercard

returns cylinderheapar:

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

offer cylinderheapar:

• options: Ship-to-home
• started: April 5, 2026
• sold: 0
• availability: In Stock
• quantity: 1
• best offers: True

general cylinderheapar:

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

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