SPEEDMASTER PCE276.1022.03 Forged Crank 840136528661 4340 ST-3.750 M-400 RJ-2.1

( Brand: Speedmaster ), ( Manufacturer Part Number: PCE276.1022.03 ), ( Part Type: Crank ), ( UPC: 840136528661 )

Review SPEEDMASTER 4340 Forged Crank Chevy fits ST-3 750 400

The **Speedmaster PCE276.1022.03 4340 Forged Crankshaft (ST-3.750" Stroke, M-400, RJ-2.1)** is a premium, high-performance crankshaft engineered for serious Chevy 400 engine builders seeking maximum durability, precision, and power output. Crafted from **4340 alloy steel**, this crankshaft is forged to exacting standards, ensuring superior strength and resistance to fatigue, even under extreme loads. The **3.750-inch stroke** delivers a substantial displacement boost, making it an ideal choice for high-horsepower applications, including supercharged, turbocharged, or naturally aspirated builds targeting serious power levels. The **M-400** designation indicates a robust main journal design capable of handling the stresses of aggressive engine modifications, while the **RJ-2.1** rod journal specification ensures smooth operation and longevity, even under extreme RPM and torque conditions.

This crankshaft features **ground and polished journals** for a precise fit within the engine s bearing surfaces, minimizing friction and maximizing efficiency. The **counterweights are dynamically balanced** to reduce vibration, enhancing drivability and longevity, particularly in high-revving applications. The **forged construction** eliminates the risk of cracking or failure under extreme stress, making it a reliable choice for both street and competition builds. Whether paired with a supercharger, turbocharger, or high-performance camshaft, this crankshaft provides the structural integrity needed to withstand the demands of modern high-output engines.

Designed for **Chevy 400 applications**, this crankshaft is compatible with a wide range of engine configurations, including LS-based, small-block, and even some big-block setups with proper clearance adjustments. The **precision machining** ensures tight tolerances, allowing for optimal bearing clearance and reduced oil consumption. Whether you're building a **high-torque street machine, a high-revving drag car, or a competition engine**, the **Speedmaster PCE276.1022.03** delivers the strength and reliability required to push performance boundaries without compromising durability. Built for those who demand nothing less than the best, this crankshaft is a cornerstone for any serious engine builder aiming for serious power.

### **Pros and Cons of buying a Speedmaster PCE276.1022.03 4340 Forged Crank (ST-3.750, M-400, RJ-2.1 for Chevy 400)**

#### **Pros**

1. **High-Quality Forged Crankshaft**

- The crank is forged from **4340 alloy steel**, which is known for its strength, durability, and resistance to fatigue. Forged cranks are generally more reliable than cast cranks, especially under high stress or forced induction.

2. **Balanced and Precision-Machined**

- Speedmaster cranks are **dynamically balanced** and precision-machined to tight tolerances, reducing vibration and improving engine smoothness. This is particularly beneficial for high-performance applications.

3. **Compatibility with Chevy 400 Engines**

- The **ST-3.750** (stroke) and **M-400** (main journal size) specifications ensure a direct drop-in fit for most **Chevy 400** engines, including small-block applications. The **RJ-2.1** rod journal size is also standard for most 400-based builds.

4. **Forced Induction Ready**

- The **4340 steel** construction makes this crank suitable for **turbocharging or supercharging**, as it can handle higher stress levels without failing. This is a major advantage for builders pushing power beyond stock levels.

5. **Reputable Brand**

- Speedmaster is a well-respected manufacturer in the performance crankshaft market, known for reliability and consistent quality. Their cranks are commonly used in racing, drag racing, and high-performance street builds.

6. **Warranty and Support**

- Speedmaster offers **warranty coverage** on their cranks, which provides peace of mind in case of manufacturing defects. Their customer service is generally responsive for performance parts.

7. **Improved Longevity Over Stock**

- If your engine is running a stock crank that has been stressed (e.g., from high RPM, forced induction, or aggressive tuning), replacing it with a **4340 forged crank** can significantly extend engine life and reduce the risk of catastrophic failure.

8. **Potential for Increased Power**

- A stronger crank can allow for **higher RPM operation** or **more aggressive camshafts** without fear of failure, enabling more power extraction from the engine.

---

#### **Cons**

1. **Cost**

- Forged cranks are **significantly more expensive** than stock or aftermarket cast cranks. A Speedmaster 4340 crank will likely cost **$1,000 $1,800 **, depending on additional features (e.g., balancing, grinding, or custom machining).

- This is a **major upfront investment**, especially for budget-conscious builders.

2. **Not Always Necessary for Stock or Mild Builds**

- If your **Chevy 400 is running stock or with mild modifications** (e.g., carbureted, naturally aspirated, stock cam), a **stock crank or a high-quality aftermarket cast crank** (e.g., Eagle, JE, or Crane) may be sufficient.

- A forged crank is **overkill** for low-power applications and may not justify the cost.

3. **Installation and Break-In Requirements**

- Forged cranks require **proper installation** (correct bearing clearances, oil flow, and alignment) to prevent premature wear or failure.

- A **careful break-in process** is necessary to ensure longevity, which may involve **limited RPM and torque** during initial runs.

4. **Potential for Overbuilding**

- If the rest of your engine (e.g., rods, pistons, bearings, oil pump) is **not upgraded to match**, a forged crank alone may not be enough to handle extreme power levels. This could lead to **bearing failure or rod bearing issues** if other components are weak.

5. **Weight Consideration**

- Forged cranks are **heavier** than cast cranks, which can slightly reduce **revving potential** in high-RPM applications. However, the difference is usually negligible unless running extreme power levels.

6. **Limited Aftermarket Support (Compared to Stock)**

- If you ever need **replacement parts** (e.g., rods, bearings) in the future, some aftermarket components may not be as widely available for a **custom crank setup** as they are for stock or common aftermarket cranks.

7. **Risk of Improper Installation Leading to Failure**

- If not installed correctly (e.g., incorrect bearing clearances, improper oil flow, or misalignment), a forged crank can still fail, voiding the warranty. This requires **expert machining or a trusted engine builder**.

---

### **Ending Conclusion**

The **Speedmaster PCE276.1022.03 4340 forged crank** is an **excellent choice** for **high-performance Chevy 400 builds**, especially those involving **forced induction, high RPM, or aggressive tuning**. Its **superior strength, durability, and precision** make it a **reliable upgrade** for builders pushing serious power. However, it is **not a necessary upgrade** for **stock or mildly modified engines**, where a **high-quality cast crank** would suffice at a fraction of the cost.

### **Recommendation**

- You are **building a high-performance Chevy 400** (turbocharged, supercharged, or high-RPM naturally aspirated).

- Your engine will be **running aggressive camshafts, high compression, or forced induction**.

- You want **maximum reliability and longevity** under extreme stress.

- You are **working with a trusted engine builder** who can ensure proper installation and break-in.

- Your engine is **stock or mildly modified** (carbureted, naturally aspirated, stock cam).

- You are on a **tight budget** and can achieve similar performance with a **high-quality cast crank** (e.g., Eagle, JE, or Crane).

- You are **not running forced induction** and do not need the extra strength.

- You are **not experienced with engine building** and cannot ensure proper installation.

For **serious power builders**, this crank is a **worthwhile investment**. For **casual or stock builds**, it is **overkill and unnecessary**. Always **match the crank with the rest of your engine components** (rods, bearings, oil pump) to ensure a balanced and reliable setup.

Details:

Condition: New. Chevy 400 4340 Forged Steel Crankshaft ST-3.750 M-400 RJ-2.1 RMS-2Pc Baal-Extol These PCE crankshafts are made from the same strong aircraft-quality forging as standard-weight cranks, but have profiled counterweights for less weight. MSRP: $952.70. Brand: Speedmaster.

Domestic Shipping: The shipping cost on this listing or the Free Shipping is for lower 48 States. Items must be New, Unused, Not Installed, in the Original Packaging and able to resold. These crankshafts feature profiled aery-wing counterweights and have straight shot chambered oil holes. MPN: PCE276.1022.03.

PCE lightweight crankshafts are perfect for engines wanting quicker rpm. Precision-ground, heat-treated, shot-preened, inspected, and micro-polished for superior tolerance control Nitrite-hardened wear resistance Features large radius on all journals improved strength. Manufacturer: Speedmaster. PCE crankshafts are nitrite-hardened, with large radii on all journals for superior wear resistance, and use lightening holes in rod throws.

part #: pce276102203 prices

• $949.00-$961.92

specifications cranshafengin:

• for models: St-3, 750, 400
• for makes: Chevy
• brand: Speedmaster
• mpn: Pce276.1022.03
• part type: Crank
• upc: 840136528661

seller cranshafengin:

• city: Grant, Michigan
• # reviews: 182834
• rating: 99.5%

shipping cranshafengin:

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

returns cranshafengin:

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

general cranshafengin:

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

offer cranshafengin:

• availability: In Stock
• started: June 10, 2026
• sold: 0
• options: Ship-to-home

payments cranshafengin:

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

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