CALLIES AWO-31N-CS Ls Compstar Forged Crankshaft APO-31Q 4.00 4340 Counterweight

( Brand: Callies ), ( Manufacturer Part Number: AWO-31N-CS ), ( Part Type: Crankshaft ), ( Ipn: Apo-31q-cs )

Review CALLIES Ls 4.00 Stroke Compstar 4340 Forged Crankshaft Counterweight

The **Callies AWO-31N-CS LS 4.00 CompStar 4340 Forged Crankshaft Counterweight** represents a precision-engineered component designed to elevate the performance and reliability of high-output small-block Chevrolet engines, particularly those built around the iconic LS platform. Crafted from **4340 alloy steel**, this counterweight is forged to exacting standards, ensuring superior strength, durability, and resistance to fatigue critical attributes for engines pushing beyond stock specifications. The **CompStar** designation indicates its compatibility with the LS 4.00 crankshaft, a popular choice among builders seeking a balance of power and longevity, whether for street applications, drag racing, or high-revving performance setups. The counterweight itself is meticulously balanced and machined to fit seamlessly with the crankshaft s journals and rod bearings, minimizing vibration and maximizing smoothness under extreme loads. Its design incorporates **counterweight geometry optimized for the LS 4.00 s stroke and rod length**, reducing parasitic mass while maintaining rigidity, which is essential for engines running high compression ratios, forced induction, or aggressive camshaft profiles. Built to withstand the stresses of high RPM and torque, this counterweight is a testament to Callies reputation for craftsmanship, offering a direct upgrade path for those looking to refine their engine s harmonic balance without compromising structural integrity. Whether integrated into a fresh build or retrofitted into an existing engine, this component ensures that the crankshaft operates with precision, contributing to a more efficient and durable powerplant.

**Pros and Cons of buying a Callies AWO-31N-CS LS 4.00 CompStar 4340 Forged Crankshaft Counterweight**

### **Pros**

1. **Durability and Strength** The crankshaft is forged from 4340 alloy steel, a material known for its high tensile strength, fatigue resistance, and ability to withstand extreme stress. This makes it ideal for high-performance applications, including forced induction and heavy-duty use.

2. **Precision Engineering** Callies is a reputable manufacturer specializing in high-quality crankshafts and counterweights. Their products are designed with precision machining, ensuring balanced performance and longevity.

3. **Compatibility with LS 4.00 Engines** This part is specifically engineered for the LS 4.00 engine platform, meaning it will fit seamlessly without requiring extensive modifications. It is designed to work with the CompStar line, which is optimized for performance builds.

4. **Weight Optimization** Forged crankshafts are often lighter than cast alternatives while maintaining or exceeding strength. This can improve engine balance, reduce vibration, and enhance overall drivability.

5. **Aftermarket Support and Warranty** Callies offers warranties on their products, providing some assurance against defects. Additionally, they have a strong presence in the aftermarket, meaning parts and support are widely available.

6. **Potential for Increased Power** A high-quality forged crankshaft can improve redline capabilities and durability under high RPM or boost conditions, making it a worthwhile upgrade for enthusiasts pushing their engines.

7. **Long-Term Reliability** Forged components are less prone to cracking or warping under stress compared to cast parts, which can be critical for engines running nitrous, turbocharging, or high horsepower modifications.

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### **Cons**

1. **Cost** Forged crankshafts are significantly more expensive than their cast counterparts. The Callies AWO-31N-CS is a premium product, and the price reflects its quality and performance-focused design. This may be a barrier for budget-conscious builders.

2. **Installation Complexity** Replacing a crankshaft requires significant disassembly of the engine, including removal of the pistons, rods, and other components. This is a labor-intensive process that may require professional assistance, adding to the overall cost.

3. **Potential Overkill for Stock or Mild Builds** If the engine is not heavily modified or subjected to extreme stress (e.g., high boost, nitrous, or extreme RPM), a stock or aftermarket cast crankshaft may suffice. Upgrading to a forged crankshaft may not offer noticeable benefits in such cases.

4. **Limited Availability and Lead Times** High-demand aftermarket parts like this may have longer lead times or limited stock, depending on the supplier. This could delay engine assembly or tuning.

5. **Compatibility with Other Modifications** While this crankshaft is designed for the LS 4.00, ensuring compatibility with other components (e.g., rods, pistons, or connecting rods) is essential. Mismatched parts could lead to performance issues or failure.

6. **Risk of Damage During Installation** Improper handling or installation (e.g., dropping the crankshaft or using incorrect tools) could cause surface damage or misalignment, compromising performance or safety.

7. **Maintenance and Inspection Requirements** Forged crankshafts, while durable, still require regular inspection for signs of wear, cracks, or imbalance. Neglecting maintenance could lead to catastrophic failure.

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### **Conclusion**

The Callies AWO-31N-CS LS 4.00 CompStar 4340 forged crankshaft counterweight is a high-quality, performance-oriented upgrade that offers significant benefits for engines subjected to heavy stress, forced induction, or high horsepower demands. Its forged construction ensures durability, precision, and reliability, making it a strong choice for serious builders. However, the cost, installation complexity, and potential overkill for stock or mild builds are notable drawbacks. It is best suited for enthusiasts who are committed to high-performance applications and can justify the investment in terms of longevity and power potential.

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### **Recommendation**

- You are building or modifying an LS 4.00 engine for high-performance applications (e.g., turbocharging, supercharging, nitrous, or extreme horsepower goals).

- You prioritize durability, reliability, and precision engineering over cost savings.

- You have the budget and resources to handle the installation process, either through professional assistance or your own mechanical expertise.

- You plan to run the engine at high RPMs or under sustained stress where a forged crankshaft s strength is advantageous.

- Your engine remains stock or is only mildly modified, as a standard crankshaft may be sufficient.

- You are working with a tight budget, as the cost may not be justified for your specific build goals.

- You lack experience with engine disassembly or are uncomfortable with the installation process, as improper handling could void warranties or damage the part.

- You are unable to source compatible rods, pistons, or other components to ensure proper engine balance and performance.

For most high-performance LS 4.00 builds, this crankshaft is a worthwhile investment, but it should be part of a broader strategy that includes complementary upgrades (e.g., rods, bearings, and tuning) to maximize its benefits. Always consult with a trusted mechanic or performance specialist to ensure the upgrade aligns with your engine s specific requirements.

Details:

SHIPPING IS FREE in the continental US. Items valued over $275 are shipped with adult signature required. 6.25 Rod length . 4.000 Stroke.

6 Counterweight.

part #: awo31n prices

• $854.00-$1190.22

specifications cranshafengin:

• brand: Callies
• mpn: Awo-31n-cs
• part type: Crankshaft
• ipn: Apo-31q-cs

payments cranshafengin:

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

general cranshafengin:

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

shipping cranshafengin:

• transit: 5-8 Days
• service: UPS Ground
• class: Standard
• carrier: UPS
• type: Fixed
• cost: $0.00

returns cranshafengin:

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

offer cranshafengin:

• started: February 12, 2026
• best offers: True
• sold: 0
• options: Ship-to-home
• quantity: 1
• availability: In Stock

seller cranshafengin:

• # reviews: 6222
• city: Mount Laurel, New Jersey
• rating: 100.0%

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