FRANKENSTEIN FED-113004 Cnc Cylinder Head M311 273CC

( Brand: Frankenstein ), ( Manufacturer Part Number: FED-113004 ), ( Fitment Type: Performance/custom ), ( Mounting Hardware Included: No ), ( Material: Aluminum ), ( Placement On Vehicle: Front ), ( Type: Cylinder Head ), ( Manufacturer Warranty: Yes ), ( Finish: Unfinished ), ( Country Of Origin: United States )

Review FRANKENSTEIN 273cc Cnc Ported Degree Cylinder Head fits MONSTER LS3 2011

The **Frankenstein Fed-113004 M311 Monster 273cc LS3 CNC-Machined Cylinder Head** is a meticulously engineered, high-performance aftermarket component designed to transform stock LS3 engine builds into a powerhouse of raw, unfiltered horsepower. Built from premium, high-grade aluminum alloy, this head is crafted with precision using state-of-the-art CNC machining technology, ensuring razor-sharp valve seats, perfectly contoured combustion chambers, and flawless port geometry optimized for maximum airflow. The design incorporates a **4-valve-per-cylinder architecture**, featuring **2.20-inch intake and 1.60-inch exhaust valves** that are both larger and more aggressive than stock LS3 components, allowing for significantly improved breathing at high RPMs. The **1.80-inch rocker arm studs** and **1.80-inch pushrod bores** further enhance durability and performance, accommodating high-lift camshafts and aggressive valvetrains without compromising structural integrity. This head is engineered to pair seamlessly with **LS3-based engines**, whether in naturally aspirated or forced-induction applications, making it an ideal choice for enthusiasts pushing for **600 horsepower** or those preparing for extreme builds with **nitrous oxide or turbocharging**. The **full-flow oil squirters** and **high-strength retaining hardware** ensure reliable operation under extreme stress, while the **custom porting and polishing** refine airflow dynamics, reducing turbulence and improving volumetric efficiency. Whether integrated into a **high-revving drag racing engine, a street-legal supercharged setup, or a competition-grade turbocharged powerplant**, this Frankenstein head delivers the precision, strength, and performance demanded by the most demanding builders. Built to withstand the rigors of extreme power outputs, it represents the pinnacle of aftermarket cylinder head engineering where stock limitations are shattered, and raw potential is unleashed.

### **Pros and Cons of Buying a Frankenstein Fed-113004 M311 Monster 273cc LS3 CNC Cylinder Head**

#### **Pros**

1. **High Performance Potential** The LS3 engine is a high-revving, high-compression powerplant capable of producing significant horsepower and torque when properly tuned. A well-built Frankenstein head can unlock its full potential, especially with aggressive camshafts, high-flow intake and exhaust, and supporting modifications.

2. **Customization & Tuning Flexibility** Frankenstein heads are often built to customer specifications, allowing for precise porting, valve sizes, and combustion chamber shapes tailored to specific engine builds. This can lead to better airflow and efficiency compared to stock or aftermarket heads that may not be optimized for a particular application.

3. **Durability & Strength** CNC-machined heads (like the Fed-113004 M311) are typically forged from high-quality materials and undergo rigorous stress testing. Properly built Frankenstein heads can handle high RPMs, aggressive camshafts, and forced induction without catastrophic failure if constructed correctly.

4. **Compatibility with Forced Induction** The LS3 s naturally aspirated potential makes it a great candidate for turbocharging or supercharging. A well-designed Frankenstein head can improve scavenging and breathing under boost, reducing pump losses and improving efficiency.

5. **Potential for High-RPM Reliability** When built with proper materials (e.g., forged internals, high-quality fasteners) and machining precision, a Frankenstein head can be more reliable at high RPMs than stock or mass-produced aftermarket heads, which may have weaker construction.

6. **Unique & Rare Build** Frankenstein heads are often one-of-a-kind or limited-run builds, appealing to enthusiasts who want a truly custom engine. This can also make the engine more desirable in high-performance circles.

7. **Potential for Better Cooling & Oil Flow** Some Frankenstein builds incorporate improved oil passages, cooling galleries, or valve spring retainer designs, which can enhance longevity under extreme conditions.

---

#### **Cons**

1. **High Cost** Frankenstein heads are not mass-produced; they are custom-built, which drives up the price significantly compared to stock or even high-end aftermarket heads. The cost can easily exceed $2,000 $4,000 depending on materials, machining, and customization.

2. **Quality Control Variability** Since these heads are built by individual shops or custom machinists, there is no standardized quality assurance. A poorly built head could lead to leaks, warping, or failure under load, whereas a reputable aftermarket head (e.g., JE, Comp Cams, or Fed heads) may offer more consistent reliability.

3. **Longer Lead Times** Custom builds often require weeks or even months of waiting, depending on the machinist s workload. This can delay engine projects significantly.

4. **Potential for Overbuilding** Some Frankenstein heads are built with extreme specs (e.g., oversized valves, aggressive porting) that may not be necessary for a particular application. This can lead to unnecessary complexity, higher costs, and potential issues if the engine is not tuned or supported properly.

5. **Warranty & Support Issues** Unlike OEM or reputable aftermarket parts, Frankenstein heads typically come with no warranty or limited support. If a failure occurs, the buyer is often on their own for repairs or replacements.

6. **Learning Curve for Builders** If you re not experienced with engine building, a Frankenstein head may require additional expertise to ensure proper installation, tuning, and maintenance. Improper assembly can lead to catastrophic engine failure.

7. **Market Resale Value** Custom, high-performance builds like Frankenstein heads often have limited resale value. If you decide to sell the engine later, finding a buyer may be difficult, and you may not recover much of the initial investment.

8. **Potential for Overcomplicating the Build** Some Frankenstein heads incorporate unnecessary features (e.g., exotic materials, complex porting) that may not justify the cost for a given application. A simpler, well-built aftermarket head might achieve similar results at a lower cost.

---

### **Conclusion**

A Frankenstein Fed-113004 M311 Monster 273cc LS3 CNC cylinder head is an **excellent choice for enthusiasts** who prioritize **high performance, customization, and durability** and have the budget to support it. It is ideal for **high-RPM applications, forced induction builds, or extreme power goals** where stock or standard aftermarket heads fall short.

However, it is **not the best choice** for those on a tight budget, those who value **convenience and quick turnaround**, or those who prefer **standardized, warranty-backed parts**. The risks of **variable quality, high cost, and long lead times** must be carefully considered before committing.

If you are **building a high-end, high-performance LS3 engine** (e.g., for drag racing, top-fuel, or extreme street/strip builds), a well-sourced Frankenstein head can be a **fantastic investment**. If you are looking for a **reliable, cost-effective, or stock-replacement solution**, a reputable aftermarket head (e.g., Fed, JE, or Comp Cams) may be a more practical choice.

---

### **Recommendation**

- **Proceed with a Frankenstein head** from a **reputable custom machinist** with strong reviews and a track record of reliable builds.

- **Budget accordingly** expect to spend **$2,000 $4,000 ** depending on materials and customization.

- **Ensure proper supporting modifications** (cams, fueling, cooling, and tuning) to match the head s capabilities.

- **Work with an experienced engine builder** to ensure proper assembly and break-in.

- Consider a **high-quality aftermarket head** (e.g., **Fed, JE, or Comp Cams**) that is **mass-produced, warrantied, and well-supported**.

- These heads offer **proven performance** at a **lower cost** and with **shorter lead times**.

- **Stick with a stock or mildly modified LS3 head** and focus on **supporting modifications** (cams, intake, exhaust, fueling) rather than investing in a custom head.

Ultimately, the **Frankenstein head is a premium option** it is not for everyone, but for those who want the **best possible performance from their LS3**, it can be a **worthwhile investment** when done correctly.

Details:

Ls3 M311 Frankenstein heads with springs and BTR rockers.

part #: fed113004 prices

• $359.99-$3500.00

specifications cylinderheapar:

• for models: Ls3, Monster
• for years: 2011
• brand: Frankenstein
• mpn: Fed-113004
• fitment type: Performance/custom
• mounting hardware included: No
• material: Aluminum
• placement on vehicle: Front
• type: Cylinder Head
• manufacturer warranty: Yes
• finish: Unfinished
• country of origin: United States

returns cylinderheapar:

• policy: No Returns

seller cylinderheapar:

• city: Coweta, Oklahoma
• # reviews: 19
• rating: 100.0%

shipping cylinderheapar:

• transit: 3-9 Days
• cost: $20.56
• service: UPS Ground
• class: Standard
• type: Calculated
• carrier: UPS

offer cylinderheapar:

• started: April 27, 2026
• quantity: 1
• sold: 0
• availability: In Stock
• options: Ship-to-home

general cylinderheapar:

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

payments cylinderheapar:

• wallet: Google-pay
• other
• credit card: Discover