SCAT SCA-445425L Forged Crankshaft Big Block Rear 4340 4.250 1-PIECE

( Brand: Scat ), ( Manufacturer Part Number: SCA-445425L ), ( Part Type: Crankshaft Block )

Review SCAT 4340 Forged Crankshaft 4.250 Stroke Big Block Chevy 1-piece Rear fits 250 454

SCAT SCa-445425L Forged Crankshaft for Big Block Chevy 454 - 4.250 Inch Stroke, 1-Piece Rear

The SCAT SCa-445425L Forged Crankshaft is a high-performance upgrade for your Big Block Chevy 454 engine, designed to deliver exceptional strength, durability, and power. This crankshaft is meticulously crafted from forged 4340 chromoly steel, ensuring a superior level of quality and consistency.

The SCAT SCa-445425L features a stroke length of 4.250 inches, providing a substantial increase in torque and horsepower without compromising the engine's reliability. The 1-piece rear design further enhances the crankshaft's strength and rigidity, reducing the likelihood of twisting or deflection under high load conditions.

The SCAT SCa-445425L is precision-machined to exacting standards, ensuring optimal bearing clearances and a seamless fit with other engine components. The crankshaft's journals and fillets are meticulously polished for a smooth, efficient operation, while the main cap and rod bore surfaces are precision-honed for optimal performance.

This crankshaft is designed to withstand the extreme conditions of high-performance racing and demanding street use. It is heat-treated to achieve a hardness of 60-62 Rockwell C, providing excellent fatigue resistance and longevity. The SCAT SCa-445425L also features a high-quality, Mobil 1-approved bearing package, ensuring a quiet, dependable operation.

In conclusion, the SCAT SCa-445425L Forged Crankshaft is an excellent choice for Big Block Chevy 454 engine builders seeking superior strength, durability, and power. Its forged 4340 chromoly steel construction, 1-piece rear design, and precision machining make it an ideal upgrade for high-performance applications, delivering unparalleled performance and reliability.

Analysis of the SCAT SC-445425L Forged Crankshaft for Big Block Chevy 454

1. High-Quality Material: The crankshaft is forged from 4340 chromoly steel, which is known for its strength and durability, making it ideal for high-horsepower applications.

2. One-piece Design: The one-piece design offers increased strength and rigidity, reducing the chance of failure or flexing under load.

3. Precision Manufacturing: SCAT is known for its precision manufacturing, ensuring a crankshaft with tight tolerances and good balance.

4. Suitable for Big Block Chevy 454 Engines: Designed specifically for big block Chevy 454 engines, this crankshaft promises a perfect fit and optimal performance.

1. High Cost: Forged crankshafts like this one are often more expensive than their cast counterparts, which may be a deterrent for some buyers.

2. Requires Professional Installation: Due to the complexity of installing a crankshaft, it is highly recommended to have a professional do the job to ensure proper assembly and alignment.

3. Potential for Custom Machine Work: Depending on the specific needs of your engine build, custom machine work may be required, which could add to the overall cost and complexity of the project.

Conclusion: The SCAT SC-445425L Forged Crankshaft is a high-quality, durable option for those looking to build a high-performance big block Chevy 454 engine. Its one-piece design, precision manufacturing, and use of high-grade materials make it an attractive choice. However, the high cost and requirement for professional installation may deter some potential buyers. If the cost is within your budget and you are comfortable with the installation process or have access to a professional, this crankshaft could be a valuable addition to your engine build. If not, you may want to consider alternatives that are more cost-effective or easier to install.

Details:

Std/std rods and mains Fresh Polish. The SCAT 4340 Forged Crankshaft is a high-quality, durable engine part designed for Big Block Chevy 454 engines. With a 4.250'' stroke length , this 2 piece rear crankshaft is manufactured by Scat and features sturdy construction suitable for demanding engine applications.

part #: sca445425l price

• $1239.99

specifications cranshafengin:

• for models: 250, 454
• for makes: Chevy
• brand: Scat
• mpn: Sca-445425l
• part type: Crankshaft Block

seller cranshafengin:

• # reviews: 259
• city: Howard, Ohio
• rating: 96.8%

offer cranshafengin:

• quantity: 1
• options: Ship-to-home
• sold: 0
• started: January 11, 2026
• availability: In Stock

general cranshafengin:

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

payments cranshafengin:

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

returns cranshafengin:

• policy: No Returns

shipping cranshafengin:

• cost: $96.70
• transit: 4-9 Days
• class: Standard
• service: USPS Ground Advantage
• type: Calculated
• carrier: USPS

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