BFO KELJN9 Conversion Big Block Motor Mount 74 383

( Brand: Bfo ), ( Manufacturer Part Number: KELJN9 ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Custom Bundle: Yes ), ( Fit 1: For Dodge 1970 1974 E Body. ), ( Fitment Type: Direct Replacement ), ( Items Included: Bracket, Engine Mount, Mounting Hardware ), ( Manufacturer Warranty: 2 Years ), ( Material: Steel ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part. ), ( Number In Pack: 1 Kit ), ( Oe/oem Part Number: Motor Mount ), ( Quantity: 1x Motor Mount )

Review BFO Conversion Big Block Motor Mount 74 383 Dodge fits 440 1970

The **BFO KELJN9 Conversion Big Block Motor Mount** is a meticulously engineered, high-performance upgrade designed specifically for classic Dodge engines, including the legendary 70-74 383 and 440 big-block configurations. This precision-crafted motor mount is crafted from heavy-duty, high-strength steel, ensuring unmatched durability and structural integrity under the most demanding driving conditions. Unlike stock mounts that are often prone to fatigue or misalignment, the KELJN9 features a robust, reinforced design that minimizes vibration transfer, enhances engine stability, and significantly reduces flex, which is critical for maintaining optimal power delivery and drivability. The mount s unique geometry is optimized to align perfectly with the engine s center of gravity, promoting a smoother, more balanced ride while reducing stress on the engine block and transmission housing. This conversion mount is not merely a replacement it s a performance-enhancing solution that addresses common issues associated with stock motor mounts, such as premature wear, rattles, and alignment problems. Whether you re running a high-performance street rod, a drag racing engine, or a reliable daily driver, the KELJN9 ensures a secure, rigid foundation that allows your big-block to operate at its peak efficiency. Built to exacting standards and designed with both performance and longevity in mind, this mount is an essential component for any serious Dodge enthusiast looking to eliminate weak points and maximize the potential of their classic muscle engine.

Buying the **BFO Keljn9 Conversion Big Block Motor Mount for 1970-1974 Dodge 383/440** (often used for 426 Hemi conversions or big-block swaps) has distinct advantages and drawbacks, depending on your project goals, budget, and technical comfort level. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Compatibility with Big-Block Swaps**

The Keljn9 mount is specifically designed to accommodate big-block engines (e.g., 426 Hemi, 440 Magnum, or other 426/440 big-blocks) in a 383/440 small-block frame. It bridges the gap between the stock small-block mounts and the taller, wider big-block engine bay, ensuring proper alignment and clearance.

2. **Improved Engine Bay Fitment**

Stock 383/440 frames lack the necessary reinforcement and spacing for a big-block engine. The Keljn9 mount provides a custom-engineered solution that secures the engine to the frame rails while maintaining proper torque box and transmission linkage alignment. This reduces the need for extensive frame modifications.

3. **Reduces Need for Frame Modifications**

Without the Keljn9, installing a big-block in a 383/440 frame often requires cutting or welding the frame rails, which can compromise structural integrity. The Keljn9 mount minimizes this risk by offering a bolt-on alternative that fits within the existing frame structure.

4. **Supports Hemi Conversions**

If you're converting a 383/440 to a 426 Hemi, the Keljn9 mount is a critical component. It ensures the Hemi s taller deck height and wider valve covers clear the firewall and hood, while also providing proper engine mounts for a smooth ride.

5. **Retains Stock Drivetrain Components**

In many cases, the Keljn9 mount allows you to keep the stock transmission (e.g., TorqueFlite or B-body 727), bellhousing, and drivetrain components, reducing the need for additional upgrades or replacements.

6. **Better Weight Distribution**

Big-block engines are heavier than small-blocks, and improper mounting can lead to excessive front-end weight transfer. The Keljn9 mount is designed to distribute engine weight more evenly across the frame, improving handling and reducing stress on the suspension.

7. **Compatibility with Aftermarket Parts**

The Keljn9 mount works well with aftermarket engine supports, torque box conversions, and other big-block-specific components. It s a modular solution that integrates with other performance upgrades.

8. **Reduces Risk of Engine Sag**

Stock small-block mounts aren t designed for the weight of a big-block. The Keljn9 mount prevents the engine from sagging or shifting during acceleration, braking, or cornering, which can damage the drivetrain or cause driveline angles to change.

9. **Time and Labor Savings**

Compared to a full frame rebuild or custom fabrication, the Keljn9 mount is a relatively quick and straightforward installation. It can save significant time and money, especially for DIYers without welding experience.

10. **Proven Reliability**

The Keljn9 mount has been used in countless big-block swaps and Hemi conversions over the years. Many owners report reliable performance with proper installation and maintenance.

---

### **Cons**

1. **Cost**

The Keljn9 mount is not cheap typically ranging from **$500 to $1,000 **, depending on whether you buy it new or used. This is a significant investment, especially when balanced against other potential upgrades (e.g., torque box, transmission, or drivetrain components).

2. **Installation Complexity**

- Remove the stock engine and transmission.

- Modify or replace the torque box (often a separate $300 $800 upgrade).

- Align the mount properly with the frame rails and engine.

- Reinstall the transmission and drivetrain, ensuring proper linkage and driveline angles.

Poor installation can lead to driveline vibration, transmission misalignment, or engine movement.

3. **Potential Drivetrain Issues**

- **Driveline vibration** (especially noticeable at higher speeds).

- **Transmission slippage** if the bellhousing isn t properly aligned.

- **Universal joint wear** if the driveline isn t perfectly balanced.

Some owners report needing to adjust or replace the driveshaft or universal joints post-installation.

4. **Limited Stock Compatibility**

The Keljn9 mount is designed for **426 Hemi and 440 Magnum** swaps, but it may not fit perfectly with other big-blocks (e.g., 426 non-Hemi, 465, or 502). If you re installing a non-standard big-block, you may need additional modifications.

5. **Torque Box Requirement**

Most big-block swaps in 383/440 frames require a **torque box** (either stock or aftermarket) to reinforce the frame and provide a mounting point for the transmission. This adds to the cost and complexity, as the torque box must be properly welded or bolted in place.

6. **Clearance Concerns**

- **Firewall modifications** (cutting or reinforcing).

- **Hood modifications** (extending the hood or using a custom hood).

- **Exhaust header routing** to avoid interference with the frame or suspension.

These modifications can add time and expense.

7. **Weight and Handling Trade-offs**

- Reduce acceleration and top-end speed.

- Strain the suspension and brakes, requiring upgrades.

- Affect fuel economy, though this is less of a concern for performance applications.

8. **Potential for Future Modifications**

If you plan to further modify the vehicle (e.g., lowering the frame, installing a different transmission, or adding a supercharger), the Keljn9 mount may require additional adjustments or replacements. This could limit long-term flexibility.

9. **Availability of Parts**

While the Keljn9 mount itself is relatively common, some supporting components (e.g., torque boxes, transmission supports, or driveline components) may be harder to find or require custom fabrication. This can delay the project if parts aren t readily available.

10. **Not a "Plug-and-Play" Solution**

Unlike some modern performance parts, the Keljn9 mount requires careful planning and execution. Cutting corners during installation can lead to reliability issues, driveline problems, or even engine damage.

---

### **Conclusion**

The **BFO Keljn9 Conversion Big Block Motor Mount** is a **highly effective solution** for installing a big-block engine (particularly a 426 Hemi or 440 Magnum) in a 1970 1974 Dodge 383/440 frame. It offers significant advantages in terms of compatibility, reduced frame modifications, and improved engine support. However, it is not without drawbacks, particularly in terms of cost, installation complexity, and potential driveline issues.

- Want to swap a big-block into a 383/440 frame without a full frame rebuild.

- Are converting a 383/440 to a 426 Hemi and need a reliable mounting solution.

- Have mechanical experience or are willing to invest time in a detailed installation.

- Are okay with potential driveline adjustments post-installation.

- Are on a tight budget and cannot afford additional components (torque box, transmission supports, etc.).

- Lack mechanical experience or access to proper tools for installation.

- Plan to make extensive future modifications that could conflict with the mount.

- Are installing a non-standard big-block that doesn t fit the Keljn9 s intended parameters.

---

### **Recommendation**

1. **Budget for the full cost** (mount torque box potential driveline upgrades).

2. **Plan for installation complexity** consider hiring a professional if DIY isn t feasible.

3. **Research driveline adjustments** be prepared to modify or replace the driveshaft, universal joints, or transmission linkage if needed.

4. **Verify compatibility** ensure your specific big-block (e.g., 426 Hemi, 440 Magnum) fits the mount s design.

5. **Invest in supporting components** a quality torque box, transmission support, and proper alignment tools are essential.

- If your primary goal is **Hemi power**, explore **pre-built Hemi conversion kits** (e.g., from **BFO, Super Stock, or Hemi Specialties**), which often include the Keljn9 mount,

Details:

Telephone number. Powder coated engine brackets. Built to strict quality control standards. Guaranteed Fitment Always the correct part.

Full physical. Conversion Big Block Motor Mount for 70 74 E 383 440 For Dodge. For Dodge 1966 - 1972 B Body, 1966-72 C-body and 1970 1974 E Body 383 440.

Fast Shipping. Condition: 100% Brand New. Package including: Motor Mounts. Applications.

Warranty: 2 Year warranty for any manufacturing defect.

specifications engimou:

• for models: 440
• for makes: Dodge
• brand: Bfo
• mpn: Keljn9
• california prop 65 warning: California Prop 65 Warning
• custom bundle: Yes
• fit 1: For Dodge 1970 1974 E Body.
• fitment type: Direct Replacement
• items included: Bracket, Engine Mount, Mounting Hardware
• manufacturer warranty: 2 Years
• material: Steel
• note: No Instruction Included
• notice: This Is Aftermarket Replcement Part.
• number in pack: 1 Kit
• oe/oem part number: Motor Mount
• quantity: 1x Motor Mount

offer engimou:

• sold: 0
• quantity: 4
• best offers: True
• options: Ship-to-home
• started: January 31, 2026
• availability: In Stock

general engimou:

• Car Truck Parts Accessories > Engines Engine Parts > Engine Mounts
• condition: New

shipping engimou:

• transit: 4-7 Days
• class: Standard
• service: FedEx Ground / FedEx Home Delivery
• type: Fixed
• cost: $0.00
• carrier: FedEx

returns engimou:

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

payments engimou:

• credit card: Visa
• wallet: Paypal
• other

seller engimou:

• city: Rowland height, California
• # reviews: 2501
• rating: 99.6%

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