EAGLE SPECIALTY PROD 4350348057CM Crank Imca 793348004365 4340 2PC

( Brand: Eagle Specialty Prod ), ( Manufacturer Part Number: 4350348057CM ), ( Part Type: Crank ), ( Minimum Rod Length: 5.700 In ), ( Prop 65 Short Label: Prop65 Warning.jpg ), ( Snout Diameter: 1.245 In ), ( Title: Esp 4340 Crank Chevy 350 2pc Imca Legal ), ( Crankshaft Stroke: 3.480 In ), ( Intended Balance: Internal ), ( Material: Forged 4340 Steel ), ( Rod Journal Width: 1.900 In ), ( Prop 65 Yes/no: Yes ), ( Target Bobweight: 1855g ), ( Main Journal: 2.449 In ), ( Rod Journal: 2.100 In ), ( UPC: 793348004365 )

Review EAGLE SPECIALTY PROD 4340 Crank Chevy 2pc Imca Legal In Stock Genuine fits 350

The **Eagle Specialty Products 4350348057CM 4340 Crankshaft (Part #4350348057CM)** is a high-performance, forged steel component designed specifically for Chevy 350 cubic inch V8 engines, offering an exceptional blend of strength, precision, and reliability for both street and performance applications. Engineered from **4340 alloy steel**, this crankshaft is heat-treated and balanced to exacting standards, ensuring superior durability under extreme loads while maintaining smooth operation across a wide RPM range. The **two-piece design** (commonly referred to as a "split" or "two-piece" crank) incorporates a forged steel main journal and a precision-machined rod journal assembly, allowing for optimized weight distribution and reduced reciprocating mass critical advantages for high-revving engines. This construction minimizes vibration and enhances power delivery, making it an ideal choice for forced induction builds, drag racing, or high-performance street applications where longevity and performance are paramount.

The **4350348057CM** crankshaft features **eight main journals** and **four rod journals**, each meticulously ground to tight tolerances for seamless integration with stock or aftermarket components. The **main journals** are polished to a fine finish, ensuring minimal friction and extended bearing life, while the **rod journals** are designed to accommodate standard Chevy 350 rod bearings without modification. The crank s **counterweights** are dynamically balanced to eliminate harmful vibrations, contributing to a quieter, more stable engine operation especially beneficial in high-RPM applications where traditional cranks may struggle. Additionally, the **rod journals** are precision-machined to match the specifications of high-performance connecting rods, allowing for optimal piston-to-crankshaft clearance and reduced stress on the rod bolts.

Forged from **4340 alloy steel**, this crankshaft undergoes a rigorous **heat-treatment process**, including **oil quenching and tempering**, to achieve an optimal balance of strength and toughness. This treatment results in a **hardened surface** with a **ductile core**, providing exceptional resistance to fatigue and bending stress qualities that are essential for engines subjected to prolonged high-load conditions. The **forged construction** also ensures superior grain flow, reducing the risk of catastrophic failure under extreme stress, whether from boosted supercharging, turbocharging, or aggressive racing applications. Unlike cast cranks, which may develop internal stresses over time, this **fully forged** design maintains structural integrity even under the most demanding circumstances.

The **4350348057CM** is a **drop-in replacement** for stock Chevy 350 cranks, meaning it can be installed without requiring major engine modifications though it is recommended to pair it with complementary high-performance components like forged rods, upgraded bearings, and a supporting camshaft for optimal results. Its **precision machining** ensures compatibility with stock Chevy 350 engine blocks, including those from small-block Chevy engines from the late 1960s through the 1980s, making it a versatile upgrade for both classic and modern builds. Whether you're building a **high-horsepower street machine, a top-fuel dragster, or a reliable daily driver**, this crankshaft delivers the **strength, balance, and longevity** required to handle the most demanding applications with confidence.

For enthusiasts seeking **maximum performance and reliability**, the **Eagle Specialty 4340 crankshaft** stands out as a premium alternative to stock or aftermarket options, offering a **superior strength-to-weight ratio** and **enhanced durability** that can significantly extend the lifespan of your engine. Its **two-piece design** also allows for **custom rod length adjustments** if needed, providing additional flexibility for builders looking to fine-tune their engine s balance and power characteristics. Whether you're pushing the limits in a **high-RPM racing application** or simply upgrading a **high-mileage street engine**, this crankshaft represents a **proven, high-quality investment** that will help you achieve **consistent, reliable performance** for years to come.

**Pros and Cons of buying a Eagle Specialty Products 4350348057CM 4340 Crank for a Chevy 350 (2-Piece IMCA)**

### **Pros**

1. **High-Quality Material** The crank is forged from **4340 chromoly steel**, a material known for its strength, durability, and resistance to fatigue. This makes it suitable for high-performance applications, including forced induction and heavy-duty street/strip use.

2. **Balanced Design** The **2-piece IMCA (Integrated Main Counterweight Assembly)** design is a proven configuration for Chevy small-block engines. It offers better balance and reduced vibration compared to traditional 1-piece cranks, which can improve longevity and smoothness, especially under heavy loads.

3. **Compatibility** This crank is specifically designed for the **Chevy 350** (L34, L98, etc.), ensuring proper fitment with stock and aftermarket components. It maintains the same bolt pattern and journal sizes as the stock crank, making it a straightforward drop-in replacement.

4. **Performance Potential** The 4340 steel is heat-treatable, meaning it can be further processed (e.g., nitriding or induction hardening) to enhance strength and wear resistance. This makes it a good choice for builders pushing power beyond stock levels.

5. **Warranty and Reputation** Eagle Specialty Products is a well-regarded brand in the performance engine market, offering reliable cranks with good customer support and warranties. Their products are often used in professional engine-building shops.

6. **Maintenance of Stock Dimensions** Unlike some aftermarket cranks that require rod or block modifications, this crank maintains the same **main and rod journal sizes** as the stock Chevy 350 crank, simplifying installation and reducing costs.

7. **Versatility** Works well in both **street/strip** and **light-duty racing** applications. It s not intended for extreme high-performance (e.g., supercharged or turbocharged engines without additional reinforcement), but it s a solid choice for moderate power gains.

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### **Cons**

1. **Not for Extreme Power Levels** While 4340 steel is strong, it is **not as robust as forged aluminum cranks** (e.g., Eagle s 6061-T6 or billet cranks) for extreme power applications (e.g., 800 hp with forced induction). A stock Chevy 350 block may require additional reinforcement (e.g., main cap bolts, rod bolts, or a billet main cap set) to safely handle high power.

2. **Weight** 4340 steel cranks are heavier than aluminum cranks. While this can improve inertia and balance, it may slightly reduce engine revving potential compared to lighter billet cranks.

3. **Cost** This crank is **more expensive than a stock replacement crank** but may be comparable to or slightly less than a billet crank. However, if you re building a high-performance engine, the cost may be justified for the added strength.

4. **Requires Proper Installation** Like any crank, improper installation (e.g., incorrect torque specs, misaligned rods, or worn bearings) can lead to failure. This crank demands **precision assembly** to avoid issues like rod bearing failure or main bearing wear.

5. **Limited Customization** Unlike billet cranks, you cannot machine this crank for custom rod journal sizes or other modifications. It s a **stock-dimension replacement**, so if you need non-standard specs, you ll need a different crank.

6. **Potential for Stock Block Limitations** If your Chevy 350 block is **original or heavily worn**, the added stress from a 4340 crank may require additional reinforcement (e.g., main cap bolts, rod bolts, or a billet main cap set) to prevent failure. A stock block may not safely handle the power gains this crank enables without modifications.

7. **Not a "Set-and-Forget" Part** This crank is not a "bolt-on" performance upgrade. It requires **proper balancing, rod bearing selection, and engine assembly** to perform reliably. Poor assembly can lead to premature failure.

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### **Conclusion**

The **Eagle Specialty Products 4340 crank for the Chevy 350** is an excellent choice for builders looking to **upgrade from stock or add moderate performance** without the cost of a billet crank. It offers **superior strength, balance, and reliability** compared to stock cranks while maintaining compatibility with most Chevy 350 components. However, it is **not suitable for extreme power levels** (e.g., high-horsepower forced induction) without additional block reinforcement.

If your goal is **street/strip performance, mild forced induction, or a reliable upgrade for a daily driver**, this crank is a **strong recommendation**. If you re building a **high-performance engine (500 hp with forced induction)**, consider pairing it with **billet main caps, upgraded rod bolts, and high-quality bearings** to ensure safety.

For **budget-conscious builders**, a stock crank or a lower-cost 4340 crank from another manufacturer may suffice. But for those prioritizing **durability and performance**, this Eagle crank is a **solid, well-supported choice**.

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### **Final Recommendation**

- You re upgrading a **stock or mildly modified Chevy 350** for **street/strip use or mild forced induction**.

- You want a **strong, balanced 2-piece crank** that maintains stock dimensions.

- You re willing to invest in **proper assembly (balancing, quality bearings, correct torque specs)**.

- Your block is **in good condition** or you plan to reinforce it (e.g., billet main caps, ARP rod bolts).

- You re building a **high-horsepower forced induction engine** (consider a **billet crank** instead).

- Your block is **original or heavily worn** without reinforcement.

- You re on a **tight budget** and can use a stock or lower-cost 4340 crank.

- You plan to **machine the crank for custom rod journals** (this is a stock-dimension part).

- For **higher power**, look at **Eagle s 6061-T6 billet crank** or **ARP s 4340 crank**.

- For **budget builds**, a **stock 350 crank with upgraded bearings** may suffice.

- Always **balance the crank** with the rods and pistons for optimal performance.

Details:

Street or track, Eagle Specialty has a huge selection of parts to choose from, such as the greater-than-stock strength and value price SIR connecting rods, superior durability ESP H-beam rods for high-horsepower engines. For the ultimate in performance, grab one of Eagle Specialty's performance-matched rotating assembly kits, complete with rods, pistons, and crankshaft. ABOUT THE BRAND: Using decades of research and stringent quality controls, Eagle Specialty Products creates the finest steel connecting rods, crankshafts, other components for your high performance rotating assembly.

part #: 4350348057cm prices

• $947.99-$1077.99

specifications cranshafengin:

• for makes: Chevy, Eagle
• brand: Eagle Specialty Prod
• mpn: 4350348057cm
• part type: Crank
• minimum rod length: 5.700 In
• prop 65 short label: Prop65 Warning.jpg
• snout diameter: 1.245 In
• title: Esp 4340 Crank Chevy 350 2pc Imca Legal
• crankshaft stroke: 3.480 In
• intended balance: Internal
• material: Forged 4340 Steel
• rod journal width: 1.900 In
• prop 65 yes/no: Yes
• target bobweight: 1855g
• main journal: 2.449 In
• rod journal: 2.100 In
• upc: 793348004365

returns cranshafengin:

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

shipping cranshafengin:

• carrier: FedEx
• type: Fixed
• cost: $0.00
• transit: 2-6 Days
• service: FedEx Ground / FedEx Home Delivery
• class: Standard

seller cranshafengin:

• city: Defiance, Ohio
• rating: 100.0%
• # reviews: 1097

payments cranshafengin:

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

general cranshafengin:

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

offer cranshafengin:

• options: Ship-to-home
• started: February 26, 2026
• sold: 0
• availability: In Stock
• quantity: 2

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