What is the primary benefit of using a 4340 forged crankshaft?

A 4340 forged crankshaft offers significantly improved strength and durability compared to cast crankshafts. This makes it well-suited for high-performance applications where increased power and stress 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 less heat buildup, improved oil flow, and potentially longer component life.

What is the purpose of nitriding and shot peening?

Nitriding is a surface hardening process that increases wear resistance and fatigue strength. Shot peening also hardens the surface and introduces compressive stress, which further enhances fatigue life, especially in critical areas like the fillets.

Specifications

Brand: Manley Performance
Part #: 190124NB
UPC: 807298114644

Manley Chevrolet LS Forged Crankshaft - 4.100in Stroke

Name: Manley Chevrolet LS Forged Crankshaft - 4.100in Stroke
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-ls-forged-crankshaft-4-100in-stroke-t14-881332
Price: 1559.64 USD
Availability: BackOrder

$1559.64

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Manley Chevrolet LS Forged Crankshaft - 4.100in Stroke. A well-built 4340 forged crankshaft for LS engines, offering enhanced strength and durability.

Key Features

Fits Chevrolet LS engines.
Features a 4.100-inch stroke for increased displacement.
Constructed from durable 4340 non-twist forged alloy steel.
Gun drilled mains and lightened rod journals reduce weight.
Counterweights are fully profiled for precise balance.
Undergoes multi-step heat treatment and nitriding for enhanced strength.

This crankshaft is designed for Chevrolet LS engine applications. Please consult with a professional or refer to manufacturer specifications to confirm 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 foundation. This Manley Performance Pro Series crankshaft is forged from 4340 alloy steel, a material known for its excellent strength and durability under demanding conditions. With a 4.100-inch stroke, it's designed to increase displacement and potential power output for your LS build.

Manley has incorporated several features to optimize performance and longevity. The crankshaft is gun drilled and features lightened rod journals, which helps reduce overall weight for better engine response. The counterweights are carefully profiled for precise balance, crucial for high-RPM stability. To further enhance its toughness, the crankshaft undergoes a multi-step heat treatment process and nitriding, significantly increasing its resistance to wear and fatigue. The large radius journals are micro-polished to minimize friction, allowing for smoother operation and improved performance over time.

Before it leaves Manley, each crankshaft is put through rigorous quality checks. This includes stress relief, shot peening for surface hardening, and 100% magnafluxing to detect any potential flaws. This attention to detail ensures you're getting a well-built component ready for serious performance applications.