EAGLE Z440037505700 Crankshaft 4340 3.750 .010/.010 R/m

( Brand: Eagle ), ( Manufacturer Part Number: Z440037505700 ), ( 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 3.750 Stroke Chevy .010/.010 R/m fits 750 400

The **Eagle Z440037505700 4340 Steel Crankshaft (3.750" Stroke)** is a high-performance, forged component designed specifically for the **LS1-based 400 cubic inch Chevrolet engines** from the **2001 2007 model years**, including both **small-block (010) and racing/marathon (R/M) variants**. Crafted from **AISI 4340 alloy steel**, this crankshaft is precision-machined to exacting tolerances, ensuring exceptional strength, durability, and reliability under extreme stress. The **fully balanced and dynamically balanced** design minimizes vibration, making it ideal for high-RPM applications, forced induction builds, or heavy-duty street and strip use. With a **3.750-inch stroke**, this crankshaft is engineered to maximize displacement while maintaining structural integrity, allowing for increased torque and horsepower without compromising longevity. The **ground journal surfaces** and **polished rod journals** reduce friction, improving efficiency and extending engine life, while the **precision-machined counterweights** ensure optimal power delivery and smooth operation. Whether you're building a **high-performance street engine, a drag racing powerplant, or a reliable daily driver**, this Eagle crankshaft delivers the strength and precision needed to handle aggressive modifications, nitrous setups, or forced induction without fear of failure. Built to meet or exceed OEM specifications, it is a trusted choice among engine builders, racers, and performance enthusiasts seeking a dependable, high-quality component for their **400 Chevy LS1-based engine**.

### **Pros and Cons of buying a Eagle Z4400375057000 4340 Crankshaft (3.750" Stroke) for a 2001-2002 400/454 Chevy**

1. **High-Quality Material** The crankshaft is made from **4340 alloy steel**, a durable material known for its strength, fatigue resistance, and ability to handle high RPMs and heavy loads. This is superior to stock cranks in older engines, which were often made from lower-grade steel.

2. **Balanced and Precision-Machined** Eagle cranks are **static and dynamic balanced**, reducing vibration and improving engine smoothness. The machining process ensures tight tolerances, which helps prevent premature wear in critical areas like the journals and rod bearings.

3. **Increased Strength and Longevity** The **forged construction** and **heat-treated** process enhance the crank s ability to withstand higher torque and stress, making it a better choice for high-performance applications, including forced induction or heavy-duty towing.

4. **Compatibility with Stock and Aftermarket Parts** The **3.750" stroke** is a common size for the **L36 (400 CID) and L37 (454 CID) engines**, meaning it will fit stock block applications without major modifications. It also works well with aftermarket parts like forged rods, pistons, and connecting rods designed for this stroke.

5. **Warranty and Reputation** Eagle cranks are backed by a **reputable manufacturer** with a history of producing reliable parts for performance engines. While warranties vary, many Eagle cranks come with a **limited lifetime warranty** against defects in materials and workmanship.

6. **Potential for Increased Power** A stronger crank can better handle **nitrous oxide (NOx), turbocharging, or supercharging** without the risk of failure. If you plan to modify your engine for more power, this crank provides a solid foundation.

7. **Cost-Effective Upgrade** At **$400**, this crank is reasonably priced compared to other high-end aftermarket cranks (e.g., Eagle s forged cranks for smaller blocks can cost $800 ). It offers a good balance between performance and affordability for a stock-block application.

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1. **Not a "Race-Ready" Crank** While stronger than stock, the **Eagle Z4400375057000 is not a fully race-balanced or nitrous-ready crank**. It is designed for **street and light-duty performance**, not extreme high-RPM racing or heavy nitrous applications. For those needs, you may need a **fully race-balanced or nitrous-ready crank** (e.g., Eagle s Z4400375057001 or similar).

2. **Requires Additional Modifications for Full Potential** Simply installing this crank will not significantly increase power unless paired with other upgrades (e.g., **forged rods, pistons, camshaft, intake/exhaust, and fuel/ignition tuning**). The crank alone is not a "drop-in" power upgrade.

3. **Installation Complexity** Replacing a crank requires **disassembling the engine, removing the old crank, and carefully installing the new one**. This is a **labor-intensive job** that may require professional help unless you have experience with engine rebuilds. Costs for labor (if not DIY) can add **$500 $1,500 ** depending on the shop.

4. **Potential for Misalignment or Damage During Installation** If not installed correctly, the crank could be **bent, improperly seated, or damaged during assembly**. This risk exists with any crank replacement, but improper handling can void warranties or lead to engine failure.

5. **Limited Benefits for Stock Engines** If your engine is **stock or lightly modified**, the benefits of this crank may not be immediately noticeable. The biggest gains come from **pairing it with other performance parts** (e.g., a high-flow cam, headers, and a tune).

6. **Weight Consideration** While not excessively heavy, a **4340 crank is slightly heavier than some aftermarket aluminum cranks** (e.g., Eagle s aluminum cranks). This can affect **reciprocating weight**, which may require adjustments in **valvetrain components** (e.g., lighter valvesprings) for optimal high-RPM performance.

7. **Availability of Alternatives** Depending on your budget, there are **other high-quality cranks** (e.g., **Eagle s forged cranks, JE, or Holley cranks**) that may offer slightly better performance or different features (e.g., nitrous-ready balancing). However, the **Z4400375057000 is a solid mid-range option**.

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The **Eagle Z4400375057000 4340 crankshaft (3.750" stroke) is a strong, reliable upgrade** for a **2001-2002 400/454 Chevy engine**, especially if you plan to **add power through forced induction, nitrous, or heavy-duty modifications**. It provides **superior strength over stock cranks** and is a **cost-effective choice** for those looking to future-proof their engine without breaking the bank.

However, it is **not a "set-and-forget" power upgrade** its benefits are maximized when paired with **other performance parts**. If your engine remains stock or lightly modified, the crank alone may not yield dramatic gains.

For **extreme power applications (e.g., 1,000 HP, heavy nitrous, or racing)**, a **fully race-balanced or nitrous-ready crank** (e.g., Eagle s Z4400375057001) would be a better choice. But for **street performance, towing, or moderate power gains**, this crank is an excellent and **well-supported purchase**.

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You want a **strong, durable upgrade** over the stock crank.

You plan to **add power (turbo, supercharger, or nitrous)** in the future.

You are willing to **pair it with other performance parts** (forged rods, pistons, cam, etc.).

You have a **budget-friendly** approach to engine upgrades (under $500 for the crank).

You are prepared for **engine disassembly and careful installation** (or have a trusted mechanic).

You want a **drop-in power upgrade** without other modifications.

Your engine will remain **stock or lightly modified** with no plans for forced induction.

You need a **fully race-balanced or nitrous-ready crank** for extreme power.

You are **not comfortable with engine rebuild labor costs**.

1. **Verify compatibility** Ensure your **block, rods, and pistons** are compatible with the 3.750" stroke.

2. **Budget for installation** Factor in **labor costs** if not doing it yourself.

3. **Plan for supporting upgrades** Consider **forged rods, pistons, and a camshaft** to fully utilize the crank s potential.

4. **Check for warranties** Confirm the **Eagle warranty** covers defects in materials and workmanship.

5. **Compare alternatives** If your budget allows, look at **Eagle s nitrous-ready cranks** or other brands like **JE or Holley** for specialized needs.

**Overall Verdict:** **This is a smart, practical purchase** for most **2001-2002 400/454 Chevy engines** looking to **upgrade strength and prepare for future power additions**. Just be mindful of the **installation process and complementary upgrades** needed to see real performance gains.

Details:

This Crank is New crank and .010/.010 on Rod Mains. New Forged 4340 Chorally Steel 3.750 For SBC 400 cut .010/.010 on rod and mains,: Recommended up to 1500 HP: Brand Name: EAGLE. Part Number: Z. Buyer pays for return shipping.

Material: forged 4340 steel.

part #: z440037505700 price

• $875.00

specifications cranshafengin:

• for models: 750, 400
• for makes: Chevy, Eagle
• brand: Eagle
• mpn: Z440037505700
• 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

shipping cranshafengin:

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

payments cranshafengin:

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

seller cranshafengin:

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

general cranshafengin:

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

offer cranshafengin:

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

returns cranshafengin:

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

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