EAGLE SPECIALTY PRODUCTS CRS445640046135 Forged Crank 793348021409 L/w 4340 4.000

( Brand: Eagle Specialty Products ), ( Manufacturer Part Number: CRS445640046135 ), ( Part Type: Crank ), ( Performance Part: Yes ), ( UPC: 793348021409 )

Review EAGLE SPECIALTY PRODUCTS Bbc L/w 4340 Forged Crank 4.000 Stroke

The **Eagle Specialty CRS445640046135 BBC L/W 4.000 Forged Crankshaft** is a precision-engineered component designed to deliver uncompromising performance, durability, and reliability in high-stress applications, particularly within the realm of professional and performance automotive, marine, and industrial engines. Crafted from a **high-grade forged steel alloy**, this crankshaft is built to withstand extreme torque loads, high rotational speeds, and the relentless demands of heavy-duty use, ensuring long-term structural integrity and resistance to fatigue failure. The **BBC (Big-End Connecting Rod Bolt Circle)** configuration, with a **4.000-inch bolt circle diameter**, is a hallmark of this crankshaft, offering a robust foundation for connecting rods while maintaining optimal balance and minimizing vibration. This design is particularly advantageous in engines requiring robust power delivery, such as high-performance V8s, marine outboards, or specialized industrial applications where reliability is non-negotiable.

The **4340 alloy steel** from which this crankshaft is forged is renowned for its exceptional strength-to-weight ratio, heat resistance, and ability to maintain dimensional stability under extreme conditions. The material undergoes a rigorous **heat-treatment process**, including quenching and tempering, to achieve a uniform hardness and toughness throughout, eliminating the risk of stress concentrations that could lead to premature wear or catastrophic failure. The **forged construction** itself ensures superior grain flow and internal integrity, as opposed to cast components, which can develop internal voids or inconsistencies that weaken structural performance over time. This crankshaft is meticulously machined to exacting tolerances, with **precision-ground journals and counterweights** to ensure smooth operation, reduced friction, and extended bearing life. The **main and rod journal surfaces** are finished to a high polish, further enhancing lubrication efficiency and minimizing the risk of scoring or pitting under heavy loads.

Ideal for **high-performance engine builds, restoration projects, or specialized applications** where stock components fall short, this Eagle Specialty crankshaft is a testament to engineering excellence. Its **custom-fit design** allows for seamless integration into engines requiring a **4.000-inch BBC**, making it a preferred choice for enthusiasts and professionals seeking to maximize power output while maintaining structural integrity. Whether used in a **muscle car, marine engine, or industrial powerplant**, this crankshaft delivers the strength, balance, and longevity required to meet the most demanding operational challenges. Backed by Eagle Specialty s reputation for quality and craftsmanship, this component is not just an upgrade it s a foundational element for engines built to last.

### **Pros and Cons of buying a Eagle Specialty CRS445640046135 BBC L/W 4.000 Forged Crank**

1. **High-Quality Forged Construction** The crank is forged from a single billet of steel, ensuring superior strength, durability, and resistance to fatigue compared to cast or machined cranks. This makes it ideal for high-performance applications, including drag racing, street tuning, and heavy-duty use.

2. **Balanced and Precision-Machined** The BBC (Balanced and Checked) designation indicates that the crank has undergone rigorous balancing and inspection to ensure smooth operation, reducing vibration and prolonging engine life.

3. **4.000" Rod Journal** The 4.000" rod journal is a substantial size, allowing for increased power output and better handling of high torque. This is particularly beneficial for engines running high compression ratios, forced induction, or heavy-duty applications.

- **Drag racing engines** (e.g., Pro Stock, Funny Car, Top Fuel)

- **Street/Strip engines** with forced induction (turbocharged or supercharged)

- **Heavy-duty truck engines** or custom builds requiring extra strength

- **High-compression naturally aspirated engines** (e.g., LS-based, small-block Chevy, Ford, or GM big-block applications, depending on the engine block)

5. **Warranty and Reputation** Eagle Specialty is a well-respected manufacturer in the aftermarket performance industry, known for producing high-quality, reliable components. Many of their products come with warranties, though the specifics should be verified before purchase.

6. **Customization Options** The crank can be paired with other high-performance components (e.g., forged rods, connecting rods, pistons, and bearings) to further enhance engine reliability and power output.

7. **Long-Term Reliability** Forged cranks are less prone to cracking or failure under extreme stress compared to cast cranks, making them a safer choice for high-RPM or high-torque applications.

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1. **High Cost** Forged cranks are significantly more expensive than cast or stock cranks. The price reflects the superior materials and manufacturing process, but it may not be cost-effective for casual or low-power applications.

- A compatible engine block with sufficient clearance for the 4.000" rod journal.

- Potential modifications to the engine bay (e.g., relocating the oil pump, adjusting rod length, or using custom rods).

- A rebuild or custom engine build, which can be labor-intensive and costly.

3. **Limited Stock Availability** Forged cranks like this are not mass-produced for stock applications. They may require special ordering, and lead times can be longer than for OEM or aftermarket cast cranks.

4. **Requires Expert Installation** Installing a forged crank, especially in a high-performance engine, demands precision and expertise. Improper installation (e.g., incorrect bearing clearances, misalignment, or oil flow issues) can lead to catastrophic failure. This may necessitate working with a professional machine shop or engine builder.

5. **Potential Weight** While forged cranks are strong, they can be heavier than cast alternatives. This added weight may slightly reduce engine responsiveness in high-revving applications, though the performance gains typically outweigh this drawback.

6. **Not Suitable for All Engines** The 4.000" rod journal is oversized for many stock engines. It may not fit standard rod lengths or require custom rods, adding to the complexity and cost of the build.

7. **Maintenance and Cost of Ownership** High-performance engines with forged cranks often require premium lubricants, more frequent maintenance, and potentially more expensive components (e.g., forged pistons, high-quality bearings). This increases the overall cost of ownership.

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The **Eagle Specialty CRS445640046135 BBC L/W 4.000 Forged Crank** is an exceptional component for **high-performance, high-torque, or drag racing applications** where reliability and strength are critical. It is ideal for builders working on **custom engines, forced-induction setups, or extreme duty cycles** where stock or cast cranks would be inadequate. However, it is **not a practical choice for stock or mild performance applications** due to its cost, specialized requirements, and complexity.

- **Drag racing engines** (Pro Stock, Funny Car, Top Fuel).

- **Street/Strip engines** with turbocharging or supercharging.

- **Heavy-duty truck or industrial engines** requiring maximum durability.

- **High-compression naturally aspirated engines** with substantial power goals.

For **casual drivers, stock car enthusiasts, or those building modestly tuned engines**, a cast crank or a stock replacement would be more practical and cost-effective.

---

- You are building a **high-performance engine** (e.g., drag race, forced induction, or extreme power goals).

- You have a **compatible engine block** and are prepared for a **custom build** (including potential rod length adjustments).

- You are working with an **experienced engine builder** or machine shop to ensure proper installation.

- You prioritize **long-term reliability and durability** over cost savings.

- You are on a **tight budget** or building a stock or mildly tuned engine.

- You lack access to a **machine shop** or **engine builder** with experience in high-performance cranks.

- Your engine block **does not have sufficient clearance** for the 4.000" rod journal.

- You are unsure about the **long-term maintenance and cost implications** of a high-performance build.

**Final Verdict:** This crank is a **premium investment** for serious performance builders. If you meet the criteria for its use, it will significantly enhance your engine s reliability and power potential. Otherwise, consider alternatives like **forged cranks with smaller journals** or **high-quality cast cranks** that better suit your application.

Details:

Eagle added crankshafts to our lineup a few years later as well expanding offerings in connecting rods. When you stop moving forward, get passed by the competition. This,in turn, has fueled rapid growth over the years. Eagles commitment to quality and service has resulted in customer loyalty satisfaction.

part #: crs445640046135 prices

• $1258.32-$1418.66

specifications cranshafengin:

• for makes: Eagle
• brand: Eagle Specialty Products
• mpn: Crs445640046135
• part type: Crank
• performance part: Yes
• upc: 793348021409

general cranshafengin:

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

shipping cranshafengin:

• type: Fixed
• transit: 2-6 Days
• service: Standard
• cost: $0.00
• class: Standard

seller cranshafengin:

• city: San Leandro, California
• rating: 99.8%
• # reviews: 123631

payments cranshafengin:

• credit card: Discover
• other
• wallet: Paypal

offer cranshafengin:

• started: March 11, 2026
• availability: In Stock
• sold: 0
• quantity: 4
• options: Ship-to-home

returns cranshafengin:

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

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