EAGLE Z435240006200 Crankshaft 4340 4.000 .010/.010 R/m

( Manufacturer Part Number: Z435240006200 ), ( Part Type: Crankshaft ), ( Manufacturer Warranty: No Warranty ), ( Fitment Type: Performance/custom ), ( Material: Steel ), ( Finish: Polished ), ( Country Of Origin: China ), ( California Prop 65 Warning: Warning ), ( Performance Part: Yes )

Review EAGLE New 4340 Crankshaft 4.000 Stroke .010/.010 R/m fits 351

The **Eagle Z435240006200 4.000-inch forged 4340 crankshaft** is a premium, high-performance component designed specifically for Ford 351 Cleveland and Windsor engines, including the iconic **351W/010 and 351C/010** configurations. Crafted from **AISI 4340 alloy steel**, this crankshaft delivers exceptional strength, durability, and reliability, making it an ideal choice for both street and competition applications. The **4.000-inch stroke** provides a substantial boost in displacement, enhancing torque output and low-end power while maintaining smooth operation. This crankshaft features **fully machined counterweights** for precise balancing, reducing vibration and improving engine longevity. The **ground and polished journals** ensure smooth bearing operation, minimizing friction and wear, while the **hardened main and rod journals** enhance resistance to fatigue and stress. Engineered with **modern CNC machining techniques**, every surface is meticulously finished to exacting tolerances, ensuring optimal performance and compatibility with high-performance camshafts, pistons, and connecting rods. Whether used in a **high-performance street engine, drag racing setup, or restoration project**, this Eagle crankshaft delivers the strength and precision needed to handle aggressive power levels without compromising reliability. Built to meet or exceed OEM specifications, it is a trusted upgrade for enthusiasts seeking to maximize power while maintaining durability.

### **Pros and Cons of buying a Eagle Z435240006200 (4340 Crankshaft for 351W/010/.010 Rods)**

1. **High-Quality Material** The crankshaft is forged from **4340 alloy steel**, which offers excellent strength, durability, and resistance to fatigue. This material is commonly used in performance and racing applications due to its ability to handle high stress without deforming.

2. **Balanced for Performance** The **4.000-inch stroke** is a standard fit for the **351W engine**, and the crank is likely **counterbalanced** (or at least designed for smooth operation) to reduce vibration, improving drivability and longevity under heavy loads.

3. **Compatibility with 010/.010 Rods** Since the crank is specifically listed for use with **010/.010 rods**, it ensures proper clearance and fitment, reducing the risk of rod bearing failure a common issue when mismatched components are used.

4. **Potential for Increased Power** A well-built 4340 crank can support **forced induction (turbo/supercharger)** and **high RPM applications**, making it a good choice if you plan to modify the engine for performance gains.

5. **Aftermarket Support** Eagle cranks are widely used in the **Ford 351W community**, meaning you ll find **bearings, seals, and machining services** readily available if needed.

6. **Durability for Heavy-Duty Use** If you plan to use the engine for **towing, hauling, or high-torque applications**, a 4340 crank is a more robust choice than a standard cast crank.

7. **Potential for Rebuilding or Modifying** Unlike some OEM cranks, a 4340 forged crank can often be **rebalanced, polished, or even ground for a custom stroke** if needed.

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1. **Cost** At **$351**, this crank is **not cheap**, especially compared to an OEM replacement (which could be under $200). If the engine is otherwise stock or lightly modified, the expense may not be justified.

2. **Overkill for Stock or Mild Builds** If you re running a **stock or mildly modified 351W** (e.g., carbureted, naturally aspirated, with stock rods and bearings), a **4340 crank may be unnecessary**. A **rebuilt OEM crank** or even a **high-quality aftermarket cast crank** (like a **Crane or Eagle cast option**) could suffice at a lower cost.

3. **Potential for Overbuilding** If the rest of the engine (rods, bearings, block, etc.) is **not upgraded proportionally**, the crank may not see its full benefit. For example:

- **Stock rods** (especially **0.030" undersize**) may not handle the extra stress of a forged crank as well as **010/.010 or 0.060" oversize rods**.

- **Stock bearings** may wear prematurely under high loads.

- A **weak block or rod journal** could lead to failure if the crank is pushed hard.

4. **Machining and Installation Complexity** Unlike a drop-in OEM crank, this **may require machining** (e.g., balancing, polishing, or journal resizing) before installation, adding labor costs.

5. **Risk of Misuse** If the engine is **not properly supported** (e.g., weak rods, soft bearings, or a block not reinforced for high stress), the crank s advantages may be wasted, and the engine could still fail under heavy loads.

6. **Alternative Options May Be Cheaper** Other **4340 cranks** (e.g., **Crane, Eagle, or other brands**) may offer similar benefits at a lower price, so **comparing prices and warranties** is wise.

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- Run **forced induction (turbo/supercharger)**.

- Push **high RPMs or heavy torque**.

- Use it in a **racing or high-stress application**.

- Already have **010/.010 rods and upgraded bearings**.

However, if your build is **stock or mildly modified**, the **cost may not be justified**, and a **rebuilt OEM or high-quality cast crank** could be a more economical alternative.

- You re **building a high-performance or race engine**.

- You already have **010/.010 rods, upgraded bearings, and a strong block**.

- You plan to **run forced induction or extreme power levels**.

- You want **long-term durability and reliability** under heavy loads.

- Your build is **stock or lightly modified**.

- You re on a **tight budget** and can find a **rebuilt OEM or cast crank** for less.

- The rest of the engine (rods, bearings, block) is **not proportionally upgraded**.

- You don t have the **machining or installation expertise** to properly set it up.

**Final Verdict:** This crank is a **solid investment for serious performance builds**, but for **casual or stock builds**, it may be **overkill**. Always **balance the cost with your engine s intended use** before purchasing.

Details:

New Forged 4340 Chorally Steel 4.000 For 351 Cleveland cut .010/.010 on rod mains,: Recommended up to 1500 HP: Brand Name: EAGLE. Part Number: Z. Rear seal diameter: call. Buyer pays for return shipping.

Material: forged 4340 steel.: This Crank is New crank and .010/.010 on Rod Mains.

part #: z435240006200 price

• $875.00

specifications cranshafengin:

• for models: 351
• for makes: Eagle
• mpn: Z435240006200
• part type: Crankshaft
• manufacturer warranty: No Warranty
• fitment type: Performance/custom
• material: Steel
• finish: Polished
• country of origin: China
• california prop 65 warning: Warning
• performance part: Yes

seller cranshafengin:

• rating: 100.0%
• # reviews: 770
• city: Southaven, Mississippi

returns cranshafengin:

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

offer cranshafengin:

• options: Ship-to-home
• quantity: 10
• availability: In Stock
• sold: 0
• started: February 23, 2026

shipping cranshafengin:

• cost: $65.00
• class: Standard
• transit: 3-7 Days
• type: Fixed
• carrier: UPS
• service: UPS Ground

general cranshafengin:

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

payments cranshafengin:

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

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