What is the benefit of a 4340 forged crankshaft?

A 4340 forged crankshaft is significantly stronger and more durable than cast iron or cast steel crankshafts. This makes it ideal for high-performance applications where increased stress and power output are expected.

What does 'micro-polished journals' mean for performance?

Micro-polishing creates an extremely smooth surface on the crankshaft journals. This reduces friction between the journal and the bearing, leading to improved efficiency, lower operating temperatures, and extended bearing life.

What is the purpose of nitriding the crankshaft?

Nitriding is a surface hardening process that introduces nitrogen into the outer layer of the steel. This creates a very hard, wear-resistant surface on the crankshaft journals, which helps prevent damage from the bearings and improves overall longevity.

Specifications

Brand: Manley Performance
Part #: 190150NB
UPC: 807298114668

Manley Chevrolet Small Block Forged Crankshaft - 3.750in Stroke

Name: Manley Chevrolet Small Block Forged Crankshaft - 3.750in Stroke
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-small-block-forged-crankshaft-3-750in-stroke-t14-880843
Price: 1144.28 USD
Availability: BackOrder

$1144.28

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Manley Chevrolet Small Block Forged Crankshaft - 3.750in Stroke. Built for durability and performance with a 4340 non-twist forging.

Key Features

Fits Chevrolet Small Block engines.
Features a 3.750-inch stroke for balanced performance.
Constructed from a durable 4340 non-twist forged alloy steel.
Undergoes multi-step heat treatment and nitriding for enhanced strength.
Micro-polished journals with large radii reduce friction and wear.
Stress relieved and shot peened for improved fatigue resistance.

⚠️ 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 rebuilding the heart of your Chevrolet Small Block engine and aiming for serious performance, a strong crankshaft is where it all starts. This Manley Pro Series crankshaft is forged from 4340 alloy steel, a material known for its excellent strength-to-weight ratio, making it a solid choice for builds that demand reliability under stress.

Manley starts with a 4340 non-twist forging, which is then put through a multi-step heat treatment and nitriding process. This treatment significantly boosts the crankshaft's surface hardness and overall strength, helping it withstand the rigors of high-RPM operation and increased cylinder pressures. The journals are precisely micro-polished with large radii, which not only helps reduce friction for improved efficiency but also contributes to longer bearing life. Each crankshaft is also stress relieved and shot peened, further enhancing its fatigue strength. Before it leaves the factory, every single crankshaft is 100% magnafluxed to ensure there are no hidden flaws, giving you confidence in its integrity.

This crankshaft features a 3.750-inch stroke, which is a common and effective dimension for many Small Block Chevy builds, offering a good balance of displacement and piston speed. When you're putting together a performance engine, the crankshaft is a critical component, and this Manley piece is built to handle the demands of a well-built motor.