GM 12736180 Crankshaft

( Brand: Gm ), ( Manufacturer Part Number: 12736180 ), ( Part Type: Crankshaft ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Parts Included: Only Part Reference 27 On The Diagram Is Included )

Review GM Genuine Crankshaft

The **GM 12736180 crankshaft** is a precision-engineered, high-performance component designed specifically for General Motors (GM) small-block V8 engines, particularly those found in classic and modern applications such as the Chevrolet Corvette, Camaro, and high-output LS-series engines. Crafted from **forged 4340 steel**, this crankshaft is heat-treated to achieve an optimal balance of strength, durability, and fatigue resistance, ensuring it can withstand the extreme stresses of high-revving, high-horsepower applications without compromising structural integrity. The **five-main-bearing journal design** provides exceptional rigidity, reducing crankshaft deflection and improving overall engine efficiency, while the **grind finish** on the journals ensures smooth operation and minimizes friction, even under aggressive power outputs. Each journal is meticulously balanced to **OEM or better specifications**, eliminating vibration and enhancing longevity, making this crankshaft an ideal upgrade for both stock and heavily modified engines seeking reliability and performance. The **counterweights are dynamically balanced** to further reduce torsional vibration, a critical factor in engines running at elevated RPMs or under heavy loads. Whether installed in a restored classic muscle car, a high-performance street machine, or a competition-grade engine, the GM 12736180 crankshaft delivers the robustness and precision required to handle modern fuel-injected, turbocharged, or supercharged setups while maintaining the integrity of GM s legendary small-block architecture. Built to exacting standards, this crankshaft is a testament to GM s engineering heritage, offering a seamless blend of heritage design and contemporary performance capabilities for enthusiasts demanding nothing less than perfection.

**Pros and Cons of Buying a GM 12736180 Crankshaft**

The GM 12736180 crankshaft is a part commonly associated with GM small-block V8 engines, particularly those from the 302, 305, and 350 cubic inch families. Below is a detailed breakdown of its advantages and disadvantages.

### **Pros**

1. **Compatibility and Availability**

The GM 12736180 crankshaft is a widely used part, meaning it is easy to find in aftermarket stores, online marketplaces, and through GM dealerships. It fits a broad range of engines, including stock, modified, and high-performance applications, making it a versatile choice for restorations, rebuilds, or performance upgrades.

2. **Stock Performance and Reliability**

As an original GM part, the 12736180 crankshaft is designed to meet factory specifications, ensuring reliable operation in stock or lightly modified engines. It is forged from high-quality steel, which provides durability and resistance to wear under normal driving conditions.

3. **Cost-Effective Replacement**

Compared to aftermarket cranks of similar quality, the GM OEM crankshaft can be more affordable, especially when purchasing from authorized dealers or used sources. This makes it a budget-friendly option for those looking to restore or replace a crankshaft without investing in premium aftermarket parts.

4. **Balanced and Tested**

GM cranks undergo rigorous testing during manufacturing to ensure proper balancing and machining. This reduces the risk of vibration or imbalance issues that can arise with some aftermarket cranks, particularly those from less reputable manufacturers.

5. **Ease of Installation**

The 12736180 crankshaft is designed to fit standard GM engine blocks without requiring extensive modifications. This simplifies the installation process, making it accessible to DIYers and mechanics with moderate experience.

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### **Cons**

1. **Limited Performance Potential**

The GM 12736180 crankshaft is optimized for stock or mildly modified engines. It lacks the advanced features (such as counterweights, journal sizes, or material treatments) found in high-performance aftermarket cranks. For serious horsepower gains, a more robust crankshaft (e.g., from brands like Crane, Ford Racing, or Eagle) may be necessary to handle increased stress from forced induction or aggressive tuning.

2. **Potential for Wear in Aggressive Applications**

While durable for stock use, the 12736180 crankshaft may not withstand the extreme loads of high-performance applications, such as turbocharging or nitrous oxide use. Over time, this could lead to premature wear, cracking, or failure, especially if paired with inadequate lubrication or supporting components.

3. **Quality Variability in Used or Aftermarket Sources**

If purchasing a used or aftermarket 12736180 crankshaft, there is a risk of receiving a part that has been previously damaged, improperly machined, or sourced from an unreliable supplier. This underscores the importance of verifying the part s history and quality before installation.

4. **Limited Customization Options**

Unlike aftermarket cranks, the GM 12736180 does not offer customization options such as different journal sizes, counterweight configurations, or material enhancements (e.g., nitriding or shot peening). This limits its suitability for engines requiring specific dimensional adjustments or advanced treatments.

5. **Potential for Counterfeit Parts**

Due to its popularity, the 12736180 crankshaft is sometimes replicated by counterfeit manufacturers. These parts may fail to meet GM s original specifications, leading to poor performance, reduced lifespan, or catastrophic failure. Buyers should purchase from trusted sources to avoid this risk.

---

### **Conclusion and Recommendation**

The GM 12736180 crankshaft is a practical and cost-effective choice for stock or mildly modified GM small-block V8 engines. Its widespread availability, reliability, and ease of installation make it ideal for restorations, routine rebuilds, or basic performance upgrades where horsepower demands remain moderate. However, for high-performance applications such as turbocharged, supercharged, or heavily tuned engines the crankshaft s limitations in durability and stress resistance become significant drawbacks. In such cases, investing in a high-quality aftermarket crankshaft with enhanced features is strongly recommended.

- You are restoring or rebuilding a stock or lightly modified GM small-block V8 engine.

- You prioritize cost-effectiveness and ease of installation over maximum performance.

- You source the part from a reputable dealer to ensure authenticity and quality.

- Your engine is heavily modified, turbocharged, or intended for high horsepower applications.

- You require custom dimensions or advanced material treatments for reliability.

- You are purchasing from an untrusted source, as counterfeit or damaged parts pose significant risks.

For performance-focused builds, consider upgrading to a crankshaft from a specialized manufacturer that offers features tailored to your engine s demands. Always pair the crankshaft with complementary components (e.g., rods, bearings, and lubrication) to ensure optimal performance and longevity.

Details:

Just Didn't Like it. Changed My Mind. Found a Better Price.

part #: 12736180 price

• $1619.00

specifications cranshafengin:

• brand: Gm
• mpn: 12736180
• part type: Crankshaft
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• parts included: Only Part Reference 27 On The Diagram Is Included

seller cranshafengin:

• # reviews: 30919
• city: Garland, Texas
• rating: 99.0%

offer cranshafengin:

• options: Ship-to-home
• availability: In Stock
• quantity: 1
• sold: 0
• started: April 13, 2026

general cranshafengin:

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

shipping cranshafengin:

• transit: 9-15 Days
• cost: $0.00
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• class: Standard
• type: Fixed

returns cranshafengin:

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

payments cranshafengin:

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

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