1. Engine Crankshafts Products
  2. sku: 19669146293268603
  3. MOLNAR 360-4000FF6F

MOLNAR TECHNOLOGIES 360-4000FF6F Forged Block Crankshaft 4.000 4340

fits make: Mopar.

360-4000ff6f Molnar Technologies 4.000 Inch 4340 Forged Small Block Mopar Crankshaft

( Brand: Molnar Technologies ), ( Manufacturer Part Number: 360-4000FF6F ), ( Part Type: Block Crankshaft ), ( Manufacturer Warranty: 1 Year ), ( Material: Steel ), ( Performance Part: Yes )

Review MOLNAR TECHNOLOGIES 4.000 Inch 4340 Forged Small Block Mopar Crankshaft

The **MOLNAR 360-4000FF6F 4.000" Forged 4340 Steel Crankshaft** is a premium, high-performance component meticulously engineered to deliver exceptional durability, precision, and reliability for high-stress applications, particularly in Mopar-based engines such as the iconic 4.0L (240-cubic-inch) and 4.6L (283-cubic-inch) HEMI V8 platforms. Crafted from **4340 alloy steel**, a material renowned for its superior strength-to-weight ratio and fatigue resistance, this crankshaft is designed to withstand the extreme demands of forced induction, high RPM operation, and aggressive tuning scenarios without compromising structural integrity. The **4.000-inch stroke** provides a substantial power advantage, enhancing displacement and torque output while maintaining balanced harmonic motion, which is critical for smooth operation and longevity in both street and competition applications. MOLNAR s proprietary **forging process** ensures a dense, uniform grain structure, eliminating internal voids and weaknesses that can lead to catastrophic failure under heavy loads. Each journal and main bearing surface is **precision-machined to exacting tolerances**, often exceeding OEM specifications, to minimize friction, reduce wear, and maximize efficiency critical factors for engines running on nitrous oxide, turbocharging, or high-compression setups. The crankshaft s **counterweight design** is optimized for dynamic balance, reducing vibrational stress on the engine block and supporting components, which is particularly beneficial for engines running at elevated RPMs or under heavy loads. Additionally, MOLAR crankshafts are **shot-peened** to enhance surface hardness and fatigue life, further reinforcing their ability to endure the rigors of extreme performance driving. Whether installed in a **high-performance street rod, a drag racing engine, or a professional racing application**, this crankshaft serves as a backbone of reliability, offering a seamless blend of strength, precision, and performance. Built to exceed the expectations of serious builders and tuners, the MOLNAR 360-4000FF6F is not just a replacement part it s a strategic upgrade for those seeking to push the limits of their Mopar-powered engines while ensuring long-term durability.

**Pros and Cons of buying a Mopar 360-4000 Forged Block Crankshaft (4.000" Stroke, Part # 4340 Forged, MOLNAR 360-4000FF6F 4.000)**

### **Pros:**

1. **High-Quality Forged Construction** The 4340 alloy steel crankshaft is forged, which provides superior strength, durability, and resistance to fatigue compared to cast cranks. This makes it ideal for high-performance applications, including forced induction or heavy-duty use.

2. **Precision Balancing** MOLNAR cranks are dynamically balanced to factory specifications, reducing vibration and improving engine smoothness. This is particularly beneficial for high-RPM applications.

3. **Compatibility with Mopar Engines** Designed specifically for the 360/4000 series engines (such as the 360-4000, 400-4000, or related small-block Mopar applications), ensuring proper fitment with stock or modified engine components.

4. **Long-Lasting Performance** The 4340 steel offers excellent wear resistance and can handle higher stress levels than standard cranks, making it suitable for aggressive driving, racing, or long-term reliability.

5. **Aftermarket Support** MOLNAR is a well-respected manufacturer in the performance market, with strong support for custom machining, balancing, and compatibility with other high-performance parts.

6. **4.000" Stroke Optimization** The longer stroke (4.000") enhances low-end torque and power delivery, which can be advantageous for towing, drag racing, or street performance builds.

7. **Warranty Coverage** MOLNAR typically offers warranties on their cranks, providing peace of mind against defects in materials or workmanship.

---

### **Cons:**

1. **Higher Upfront Cost** Forged cranks are significantly more expensive than stock or aftermarket cast cranks. The premium price reflects the superior materials and machining involved.

2. **Potential Weight Increase** While forged cranks are strong, they are also heavier than cast alternatives. This added weight may slightly reduce engine responsiveness in high-revving applications.

3. **Requires Professional Installation** Due to the precision involved, installing a forged crank often requires experienced machining or a reputable engine builder to ensure proper alignment, bearing clearance, and balancing.

4. **Limited Stock Availability** Unlike OEM parts, forged cranks may not be readily available at local auto parts stores. Purchasing may require ordering from specialty suppliers, which could introduce delays.

5. **Compatibility Considerations** While designed for Mopar engines, modifications (such as custom rod lengths or main bearing spacing) may be necessary for non-stock applications. Ensure your build aligns with the crank s specifications.

6. **Maintenance Requirements** A forged crank in a high-performance engine may demand more frequent inspections (e.g., rod bearing clearance checks, oil flow verification) to maintain reliability.

7. **Potential for Overkill** If the engine is not heavily modified or subjected to extreme stress (e.g., street driving without forced induction), the benefits of a forged crank may not be fully realized, making it a less cost-effective upgrade.

---

### **Conclusion:**

The **MOLNAR 360-4000FF6F 4.000" 4340 forged crankshaft** is an excellent choice for enthusiasts building a **high-performance, durable, or competition-oriented Mopar engine**. Its forged construction, precision balancing, and compatibility with the 360/4000 series make it a reliable upgrade for those seeking longevity and power. However, the **higher cost, weight, and installation complexity** mean it is best suited for serious builds rather than casual or stock applications.

### **Recommendation:**

- **Buy if:** You are constructing a **high-performance, forced-induction, or racing engine** where durability and strength are critical. The 4.000" stroke also benefits torque-focused applications like towing or drag racing.

- **Skip if:** Your project is a **stock or lightly modified engine** where a cast crank or OEM replacement would suffice. The cost may not justify the upgrade for mild performance gains.

- **Consider alternatives:** If budget is a concern, explore **high-quality cast cranks** (e.g., Clevite or Eagle) or **aftermarket forged cranks** from other manufacturers (e.g., JE, Scat) that may offer similar performance at a lower price.

For the best results, pair this crank with **high-quality rods, bearings, and a reputable engine builder** to ensure optimal performance and longevity.

Details:

New in original packaging Molnar technologies 4.000 stroke 4340 forged small block Mopar crankshaft.

part #: 3604000ff6f prices

  • $1100.00-$1411.67

specifications cranshafengin:

  • for makes: Mopar
  • brand: Molnar Technologies
  • mpn: 360-4000ff6f
  • part type: Block Crankshaft
  • manufacturer warranty: 1 Year
  • material: Steel
  • performance part: Yes

seller cranshafengin:

  • rating: 0.0%
  • city: Manchester, Maryland
  • # reviews: 0

returns cranshafengin:

  • policy: No Returns

payments cranshafengin:

  • credit card: Diners-club
  • other
  • wallet: Paypal

general cranshafengin:

  • Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
  • condition: New other see details

offer cranshafengin:

  • best offers: True
  • availability: In Stock
  • options: Ship-to-home
  • sold: 0
  • started: April 4, 2026
  • quantity: 1

shipping cranshafengin:

  • class: Standard
  • cost: $83.30
  • carrier: UPS
  • service: UPS Ground
  • transit: 5-11 Days
  • type: Calculated
for makes: mopar, part type: block crankshaft, manufacturer warranty: 1 year, performance part: yes,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, material: steel, sku: 19669146293268603,
Molnar Technologies 360-4000FF6F Is Similar To:
cranshafengin logo
5 offers $1100.00–$1411.67 USD
  • New other (see details). Offer #1 priced at $1100.00 + $40.31 shipping estimate = $1140.31* total. New in original packaging Molnar technologies 4.000 stroke 4340 forged small block Mopar crankshaft.+$40.31 shipping
  • New. Offer #2 priced at $1372.28 + $79.00 shipping estimate = $1451.28* total. 340-3790EB6F Small Block Chrysler -2.100" Rod Pins 3.790 340 2.100 6.123 1850. CHRYSLER SMALL BLOCK FORGED CRANKS.+$79.00 shipping
  • New. Offer #3 priced at $1411.67 + $79.00 shipping estimate = $1490.67* total. +$79.00 shipping
  • New. Offer #4 priced at $1411.67 + $79.00 shipping estimate = $1490.67* total. +$79.00 shipping
  • New. Offer #5 priced at $1411.67 + $79.00 shipping estimate = $1490.67* total. +$79.00 shipping

Copyright © cranshafengin.com