GM 124549 Nos Key Woodruff Gear Crankshaft 43 No.

( Brand: Gm ), ( Manufacturer Part Number: 124549 ), ( Part Type: Gear Crankshaft )

Review GM Nos Oem Genuine 43 Key Wood Ruff No. Gear To Crankshaft

The **GM 124549 (Part No. 43 Key Woodruff Gear Crankshaft)** is a precision-engineered component designed for high-performance automotive applications, particularly within General Motors small-block and performance-oriented engine families. This crankshaft is meticulously crafted from high-grade forged steel, ensuring exceptional durability, strength, and resistance to fatigue under extreme stress conditions. The **Woodruff keyway** (part no. 43) is a critical feature, providing a secure and precise fit for the main bearing journals, which are ground to tight tolerances for optimal alignment and load distribution. The crankshaft s **counterweights** are dynamically balanced to minimize vibration, enhancing smooth operation and longevity, even under heavy loads or high RPM scenarios. Whether integrated into a **LS-series engine, small-block Chevy, or performance-oriented application**, this crankshaft delivers reliable power transmission, making it an ideal choice for enthusiasts seeking enhanced performance, durability, and reliability in their engine builds. Its robust construction and precision machining ensure it meets or exceeds OEM specifications, while its compatibility with aftermarket components further expands its versatility for custom engine projects.

### **Pros and Cons of Buying a GM 124549 (NOS 43 Key Woodruff Gear Crankshaft)**

The GM 124549 crankshaft is a highly sought-after part for classic Chevrolet engines, particularly those in the small-block (pre-1970) and some early big-block configurations. Here are the key advantages of purchasing one:

1. **New Old Stock (NOS) Condition** A NOS crankshaft means it is factory-new, unused, and in original packaging. This ensures no wear, no modifications, and full compatibility with the original engine specifications. It is a reliable choice for restoration projects where authenticity is important.

2. **High Quality and Durability** GM crankshafts from this era were built to strict standards, using forged steel for strength and longevity. The 43-key design (with a Woodruff keyway) is common in early small-block engines (e.g., 265, 283, 327, 350), making it versatile for various applications.

- **Pre-1970 small-blocks** (e.g., 265, 283, 327, 350)

- Some early **big-blocks** (e.g., 396, 427) with minor modifications

- Aftermarket builds where a stock-like crank is desired

It is also compatible with **Chevrolet, Pontiac, Oldsmobile, and Buick** engines of similar displacement.

4. **Ease of Installation** Since it is a direct replacement, installing a NOS crankshaft requires minimal machining (unless the engine bore or deck height differs). It can be used in stock or lightly modified engines without major adjustments.

5. **Resale and Collectibility Value** NOS parts, especially from classic GM engines, hold value over time. If the engine is restored to original condition, the crankshaft remains a desirable component for future buyers or collectors.

6. **Reliability for Street Use** While not built for extreme performance, this crankshaft is robust enough for daily driving, light towing, and street applications. It can handle stock compression ratios and torque without excessive stress.

7. **Availability of Supporting Parts** Since this is a common GM crankshaft, rods, bearings, seals, and other components are widely available, making maintenance and repairs easier.

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- **Standard journal sizes** (not oversized or performance-machined)

- **Lower stress relief** compared to modern or aftermarket cranks

- **No counterweights optimized for high RPM** (not ideal for forced induction or extreme power)

It is not suitable for **high-performance builds** (e.g., nitrous, turbocharging, or high horsepower applications) without modification.

2. **Weight and Balance Considerations** The crankshaft is **heavier** than modern or aftermarket alternatives, which can reduce engine revving potential and responsiveness. Lightweight cranks (e.g., forged aluminum or billet) are preferred in performance applications.

3. **Potential for Misalignment Issues** If the engine block or main bearing caps are worn or improperly machined, a stock crankshaft may not align perfectly, leading to **vibration or premature wear**. This requires careful inspection of the block and bearings.

4. **Cost Compared to Aftermarket Options** While NOS cranks are high-quality, they can be **more expensive** than aftermarket alternatives (e.g., Eagle, Crane, or JE). For performance builds, a **forged or performance crank** may offer better value long-term.

- Different journal sizes

- Custom counterweight balancing

- Special machining (e.g., polished rods, shot-peened surfaces)

If modifications are needed, additional machining costs will apply.

6. **Risk of Counterfeit or Rebuilt Parts** Since NOS parts are valuable, there is a risk of purchasing **fake or rebuilt cranks** disguised as NOS. Buyers must verify:

- Original packaging (if available)

- Serial numbers matching GM records

- Seller reputation (preferably from a trusted dealer or auction with authentication)

7. **Not Ideal for High-Torque Applications** While it handles stock torque well, **heavy towing or high-torque modifications** (e.g., big-block swaps, high-compression kits) may stress the crank beyond its original design limits.

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### **Ending Conclusion**

- **Restoration projects** where authenticity and stock-like performance are priorities.

- **Stock or lightly modified small-block engines** (pre-1970 GM).

- **Budget-conscious buyers** who want a reliable, high-quality part without performance compromises.

- **Collectors or enthusiasts** who value original components.

- **High-performance or forced-induction builds** (requires a performance crank).

- **Engines with excessive modifications** (e.g., big-block swaps, extreme compression).

- **Applications requiring lightweight or high-RPM capability** (e.g., drag racing, high-revving street engines).

---

### **Final Recommendation**

You are restoring a **pre-1970 small-block GM engine** to stock specifications.

You need a **reliable, high-quality replacement** for a stock or mildly modified engine.

You prioritize **authenticity and ease of installation** over extreme performance.

You plan to **keep the engine in stock or near-stock condition** for daily driving.

You are building a **high-performance engine** (e.g., turbocharged, nitrous, or high-horsepower).

You need **oversized journals, lightweight balancing, or custom machining**.

You are working with a **modified block** (e.g., big-block swap, aggressive decking) that may require a different crank.

You are on a tight budget and can find a **rebuilt or aftermarket crank** of similar quality at a lower cost.

- **Rebuilt GM Crankshafts** Often cheaper but may lack NOS value.

- **Aftermarket Performance Cranks** (e.g., Eagle, Crane, JE) Better for high-RPM or forced-induction builds.

- **Forged Aluminum Cranks** Lightweight and strong for extreme performance.

- **Used/Reconditioned Cranks** More affordable but require inspection for wear.

- **Reputable NOS dealers** (e.g., Classic Chevrolet Parts, GM Parts Warehouse, eBay verified sellers).

- **Auctions** (e.g., Barrett-Jackson, Bring a Trailer) with authentication.

- **Specialty engine builders** who handle GM parts.

- Check for **original GM packaging** (if available).

- Compare **serial numbers** with GM records (some sellers provide this).

- Inspect for **factory markings** (e.g., "GM" stamp, correct keyway pattern).

- Request **certification of authenticity** from the seller.

In summary, the GM 124549 crankshaft is a **solid, no-frills choice** for classic engine restorations, but it is not the best fit for modern performance applications. Always match the crank to your engine s intended use and budget.

Details:

part #: 124549 prices

• $14.88-$32.99

specifications cranshafengin:

• brand: Gm
• mpn: 124549
• part type: Gear Crankshaft

seller cranshafengin:

• # reviews: 7508
• city: Waldo, Wisconsin
• rating: 100.0%

payments cranshafengin:

• other
• credit card: Mastercard
• wallet: Paypal

shipping cranshafengin:

• carrier: USPS, UPS
• cost: $12.95
• transit: 4-10 Days
• class: Expedited, Standard
• service: USPS Priority Mail Padded Flat Rate Envelope, UPS Ground, USPS Priority Mail
• type: Calculated

returns cranshafengin:

• policy: No Returns

offer cranshafengin:

• started: March 13, 2026
• sold: 0
• best offers: True
• options: Ship-to-home
• availability: In Stock
• quantity: 1

general cranshafengin:

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

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