What is the benefit of micro-polished journals?

Micro-polishing the journals on this crankshaft helps to reduce friction within the engine. This can lead to improved performance and also contributes to the longevity of both the crankshaft and the connecting rod bearings.

What does the 4340 alloy steel and non-twist forging mean for durability?

Using 4340 alloy steel provides a strong foundation, while the non-twist forging process ensures the crankshaft maintains its structural integrity under high stress. This combination is crucial for engines that will be subjected to demanding use.

What quality checks does Manley perform on these crankshafts?

Manley performs rigorous quality assurance, including stress relieving to prevent warping, shot peening to enhance fatigue strength, and 100% magnafluxing to ensure there are no hidden flaws before the crankshaft is shipped.

Specifications

Brand: Manley Performance
Part #: 190250
UPC: 807298076850

Manley Chevrolet Big Block Forged Crankshaft - 4.375in Stroke

Name: Manley Chevrolet Big Block Forged Crankshaft - 4.375in Stroke
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-big-block-forged-crankshaft-4-375in-stroke-t14-880851
Price: 1365.53 USD
Availability: BackOrder

$1365.53

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 Forged Crankshaft - 4.375in Stroke. Built for durability and performance in high-demand builds.

Key Features

Fits Chevrolet Big Block engines.
Features a 4.375 inch stroke.
Constructed from durable 4340 alloy steel with a non-twist forging.
Undergoes multi-step heat treatment and nitriding for enhanced strength and longevity.
Large radius journals are micro-polished to reduce friction and improve performance.
Each crankshaft is stress relieved, shot peened, and 100% magnafluxed for quality assurance.

⚠️ 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

When you're building a serious Chevrolet Big Block engine, the crankshaft is the heart of the operation. This Manley Performance Pro Series crankshaft is designed for those who demand strength and reliability, whether you're aiming for serious street performance or track-ready power. It's a critical component for any rebuild where the stock unit just won't cut it.

Crafted from 4340 alloy steel using a non-twist forging process, this crankshaft is built to handle significant stress. Manley puts each one through a multi-step heat treatment and nitriding process, which really boosts its strength and ensures it can stand up to the rigors of a high-performance engine over the long haul. The journals are generously sized with large radii and then micro-polished. This not only helps reduce friction, which is key for getting every bit of power out of your engine, but it also contributes to the longevity of the bearings and the crankshaft itself.

Before any of these crankshafts leave Manley, they undergo a thorough quality assurance process. This includes stress relieving, shot peening to relieve internal stresses, and 100% magnafluxing to detect any potential flaws. This attention to detail means you're getting a well-built component that's ready to be the foundation of your next powerful build. If you're looking for a solid crankshaft for your Chevrolet Big Block, this Manley Pro Series unit is a popular choice for good reason.