What does 'Not Balanced' mean for this crankshaft?

A 'Not Balanced' crankshaft means it does not come with counterweights pre-installed to a specific balance factor. You will need to have this crankshaft professionally balanced with your chosen pistons, connecting rods, and flywheel or flexplate to ensure the engine runs smoothly and safely.

What is the benefit of the lightweight design?

The lightweight design, achieved through gun-drilled mains and lightened rod journals, reduces the overall rotating mass in your engine. This allows the engine to rev more quickly and can lead to improved throttle response and overall performance.

What is the purpose of micro-polishing the journals?

Micro-polishing the journals with large radii helps to reduce friction between the crankshaft and bearings. This not only improves performance by minimizing parasitic drag but also enhances oil flow and extends the life of both the crankshaft and bearings.

Specifications

Brand: Manley Performance
Part #: 190024NB
UPC: 807298111919

Manley Chevrolet LS 4.000in Stroke Lightweight Pro Series Crankshaft (Not Balanced)

Name: Manley Chevrolet LS 4.000in Stroke Lightweight Pro Series Crankshaft (Not Balanced)
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-ls-4-000in-stroke-lightweight-pro-series-cra-t14-464549
Price: 1506.48 USD
Availability: BackOrder

$1506.48

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 LS 4.000in Stroke Lightweight Pro Series Crankshaft (Not Balanced). A strong, lightweight crankshaft for your LS build.

Key Features

Fits Chevrolet LS engines.
Features a 4.000-inch stroke for increased displacement and power.
Constructed from durable 4340 alloy steel for strength and longevity.
Lightweight design includes gun-drilled mains and lightened rod journals to optimize engine performance.
Undergoes multi-step heat treatment and nitriding for enhanced strength and wear resistance.
Micro-polished journals with large radii reduce friction and improve oil flow.

This crankshaft is designed for Chevrolet LS engine applications. Please verify compatibility with your specific engine build.

⚠️ 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 LS engine, a strong crankshaft is the heart of the operation. This Manley Pro Series crankshaft is forged from 4340 alloy steel, a well-known material for its strength and durability in demanding engine applications. It's designed with a 4.000-inch stroke, which is a common choice for LS engines looking to increase displacement and power potential.

Manley has put a lot of thought into making this crankshaft perform. The mains are gun-drilled and the rod journals are lightened, contributing to a lighter overall rotating assembly. This can help the engine rev more freely and improve throttle response. To ensure it can handle the stress, it goes through a multi-step heat treatment and nitriding process, which hardens the surface and increases its longevity. The journals themselves are micro-polished with large radii, which helps reduce friction and wear, allowing for better oil flow and improved performance.

Before leaving the factory, each crankshaft is stress relieved, shot peened for fatigue resistance, and 100% magnafluxed to catch any potential flaws. This rigorous quality assurance process means you're getting a well-built component ready for serious work. Keep in mind that this crankshaft is sold 'not balanced,' meaning you'll need to have it professionally balanced with your specific rotating assembly components like pistons, connecting rods, and the flywheel or flexplate to ensure smooth operation and prevent excessive vibration.