What is the benefit of a 'non-twist' forging process?

A 'non-twist' forging process helps the crankshaft resist twisting forces that can occur under heavy engine loads. This design is crucial for maintaining structural integrity and preventing failures in high-performance or racing applications.

What does the micro-polishing of the journals do?

Micro-polishing the journals with large radii helps to reduce friction between the crankshaft and bearing surfaces. This can lead to improved oil flow, reduced wear, and better overall engine efficiency and longevity.

What kind of quality assurance does Manley perform on these crankshafts?

Manley Performance puts each crankshaft through a rigorous quality assurance process. This includes stress relieving, shot peening to reduce stress concentrations, and 100% magnafluxing to detect any potential flaws or cracks.

Specifications

Brand: Manley Performance
Part #: 190140
UPC: 807298062266

Manley Chevrolet Big Block 4340 Non-Twist Forgings 4.250in Stroke Crankshaft

Name: Manley Chevrolet Big Block 4340 Non-Twist Forgings 4.250in Stroke Crankshaft
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-big-block-4340-non-twist-forgings-4-250in-st-t14-268966
Price: 1318.98 USD
Availability: BackOrder

$1318.98

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Chevrolet Big Block 4340 Non-Twist Forgings 4.250in Stroke Crankshaft. A strong, durable crankshaft for high-performance builds.

Key Features

Fits Chevrolet Big Block engines.
Features a 4.250 inch stroke for increased displacement.
Constructed from durable 4340 alloy steel.
Utilizes a 'non-twist' forging process for improved torsional strength.
Undergoes multi-step heat treatment and nitriding for enhanced durability.
Micro-polished journals with large radii help reduce friction and improve oil flow.

This crankshaft is designed for Chevrolet Big Block engine applications. Please consult manufacturer fitment data for specific engine compatibility.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're building a high-performance Chevrolet Big Block engine, this Manley Performance Pro Series crankshaft is a solid foundation. It's designed with a 4.250-inch stroke, giving you the displacement potential for serious power. Manley uses 4340 alloy steel for this crankshaft, which is a well-known material for its strength and reliability in demanding engine applications.

What sets this crankshaft apart is its 'non-twist' forging process. This means it's built to resist twisting forces under heavy load, which is crucial for preventing failures in powerful engines. Manley also puts this crankshaft through a multi-step heat treatment and nitriding process. This further enhances its strength and ensures it can handle the heat and stress of high-RPM operation over the long haul. The journals are micro-polished with large radii, which helps reduce friction and improve oil flow, contributing to overall engine efficiency and longevity.

Before it leaves Manley, each crankshaft is stress relieved, shot peened, and 100% magnafluxed. This rigorous quality control ensures that every unit meets their high standards for durability and performance. This is a critical component for anyone serious about building a robust and powerful Chevrolet Big Block engine.