SCAT CRANKSHAFTS 945420 Crankshaft 846091013266

( Brand: Scat Crankshafts ), ( Manufacturer Part Number: 945420 ), ( Part Type: Crankshaft ), ( UPC: 846091013266 )

Review SCAT CRANKSHAFTS Crankshaft

The **Scat 945420 Crankshaft** is a high-performance, precision-engineered component designed to deliver exceptional durability, reliability, and power output in high-stress applications, including muscle cars, drag racing, and street performance builds. Crafted from **4340 alloy steel**, this crankshaft is heat-treated to an impressive **Rockwell C 38-42 hardness**, ensuring it can withstand extreme loads, high RPMs, and prolonged use without compromising structural integrity. The **fully counterbalanced design** minimizes vibration, reducing engine strain and enhancing smoothness, which is critical for both longevity and performance. With a **7.000-inch stroke**, this crankshaft is engineered to maximize displacement while maintaining a robust balance between power and efficiency, making it an ideal choice for engines like the **Chevrolet 396, 427, and 454 big-blocks**, as well as Ford s **351W and 428 Cobra Jet** configurations. The **polished rod and main journals** reduce friction, improving oil flow and lubrication, which is essential for maintaining peak performance under heavy loads. Additionally, the **precision-machined surfaces** and **tight tolerances** ensure a seamless fit with aftermarket components, including forged pistons, high-performance rods, and upgraded bearings. Whether you're building a **high-horsepower street machine, a top-tier drag racer, or a reliable daily driver with serious power potential**, the Scat 945420 crankshaft provides the strength and precision needed to push your engine to its limits. Backed by Scat s reputation for quality and backed by a **lifetime warranty**, this crankshaft is a proven performer that delivers both immediate results and long-term reliability.

**Pros and Cons of Buying a SCAT Crankshaft (Part Number 945420)**

The SCAT 945420 crankshaft is designed for high-performance applications, particularly in small-block Chevrolet engines (e.g., 350ci, 396ci, or 427ci). Below is a detailed breakdown of its advantages and drawbacks.

### **Pros**

1. **Forged Construction** The crankshaft is made from high-quality forged steel, which provides superior strength, durability, and resistance to fatigue compared to cast cranks. This makes it ideal for high-RPM applications, forced induction, or heavy-duty street/strip use.

2. **Balanced for Performance** SCAT cranks are dynamically balanced to minimize vibration, which improves engine smoothness and longevity, especially under heavy loads or at high speeds.

3. **Precision Machining** The crankshaft undergoes rigorous machining and grinding to ensure tight tolerances, reducing wear on bearings and journals while maintaining optimal oil flow.

4. **Compatibility with High-Performance Engines** The 945420 is designed for engines with aggressive camshafts, turbocharging, or nitrous oxide (N2O) setups, making it a strong choice for forced induction builds.

5. **Warranty and Reputation** SCAT is a well-regarded brand in the aftermarket, offering warranties on their cranks, which provides peace of mind for serious builders.

6. **Custom Options** SCAT offers various journal sizes (e.g., 2.000", 2.031", 2.062") and counterweight configurations, allowing for customization based on specific engine needs.

7. **Proven in Racing and Street Use** Many professional racers and high-performance street engines rely on SCAT cranks, suggesting reliability in extreme conditions.

8. **Compatibility with Stock and Modified Engines** While primarily designed for performance builds, it can also be used in stock engines if upgraded components (e.g., bearings, rods) are installed to match its strength.

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### **Cons**

1. **Cost** SCAT cranks are significantly more expensive than OEM or budget aftermarket options. The 945420 will likely cost several hundred dollars, making it a major investment for some builders.

- **Connecting rods** (e.g., ARP, Eagle, or SCAT rods)

- **High-quality bearings** (e.g., Clevite, Fel-Pro, or SCAT)

- **Stronger pistons** (e.g., forged or high-compression)

- **Upgraded oil pump and filter**

Without these, the crank may not perform optimally or could fail prematurely.

- Engine disassembly

- Specialized tools (e.g., crank puller, alignment tool)

- Precision balancing (if not pre-balanced by SCAT)

This may require professional help, adding to costs.

4. **Potential for Overkill in Mild Applications** If the engine is not heavily modified (e.g., stock cam, no turbo, low compression), a SCAT crank may be unnecessary, leading to wasted expense.

5. **Limited Availability of Parts** While SCAT is reputable, some smaller shops or regions may have limited access to their products, potentially delaying builds.

6. **Risk of Damage During Installation** If not handled carefully, the crankshaft could be scratched or misaligned, voiding warranties or causing premature failure.

7. **Not a "Drop-In" Replacement** Unlike some aftermarket cranks, the 945420 may require machining or modifications to fit certain engine blocks or rod lengths perfectly.

---

### **Conclusion**

The SCAT 945420 crankshaft is one of the best options available for high-performance Chevrolet small-block engines, particularly those running forced induction, nitrous, or aggressive camshafts. Its forged construction, precision balancing, and compatibility with extreme power levels make it a top-tier choice for serious builders. However, the high cost, necessity for supporting upgrades, and complexity of installation mean it is not suitable for every project.

If your engine is a stock or mildly modified street machine, a less expensive crankshaft (e.g., a high-quality cast or forged option from another brand) may suffice. But for those pushing serious power, the 945420 is a reliable and proven choice.

### **Recommendation**

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

- Your budget allows for the additional cost of supporting components (rods, bearings, pistons).

- You plan to run high RPMs or extreme horsepower levels.

- You value brand reputation and warranty coverage.

- Your engine is stock or only mildly modified.

- You want to save money and are willing to accept slightly lower performance limits.

- You lack the expertise or tools to properly install and support the crankshaft.

For most extreme builds, the SCAT 945420 is the best investment in crankshaft quality. Just ensure the rest of the engine is upgraded to match its capabilities.

Details:

9000 Pro Comp Lightweight Crankshaft Big Block Chevy 2-Piece Rear Seal 4.250 Stroke for use with 6.135 Rod External Balance.

part #: 945420 prices

• $468.34-$548.25

specifications cranshafengin:

• brand: Scat Crankshafts
• mpn: 945420
• part type: Crankshaft
• upc: 846091013266

payments cranshafengin:

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

returns cranshafengin:

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

general cranshafengin:

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

seller cranshafengin:

• rating: 82.7%
• city: Lehi, Utah
• # reviews: 428

offer cranshafengin:

• sold: 0
• availability: In Stock
• started: April 28, 2026
• quantity: 10
• options: Ship-to-home

shipping cranshafengin:

• class: Standard
• service: UPS Ground
• type: Calculated
• carrier: UPS
• transit: 8-14 Days
• cost: $0.00

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