What is the benefit of a 4340 alloy steel crankshaft?

4340 alloy steel is known for its high strength and toughness. Using it for a crankshaft, especially when combined with heat treatment and nitriding, means it can better withstand the high stresses and temperatures found in performance engines.

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

Micro-polishing creates an extremely smooth surface on the crankshaft journals. This smoothness reduces friction between the journal and the connecting rod bearing, leading to improved efficiency and potentially longer component life.

Does this crankshaft come balanced?

The manufacturer's description focuses on the material and finishing processes. While Manley performs rigorous quality checks, it's common practice for performance crankshafts to be final-balanced by the engine builder to match the specific rotating assembly (pistons, rods, flywheel/flexplate).

Specifications

Brand: Manley Performance
Part #: 190480
UPC: 807298114675

Manley Chevrolet Small Block Forged Crankshaft - 3.875in Stroke

Name: Manley Chevrolet Small Block Forged Crankshaft - 3.875in Stroke
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-small-block-forged-crankshaft-3-875in-stroke-t14-880844
Price: 1144.28 USD
Availability: BackOrder

$1144.28

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Manley Chevrolet Small Block Forged Crankshaft - 3.875in Stroke. Built from 4340 alloy steel for enhanced strength and durability.

Key Features

This crankshaft is forged from 4340 alloy steel for enhanced strength.
Features a 3.875-inch stroke, suitable for increasing engine displacement.
Undergoes a multi-step heat treatment and nitriding process for improved durability.
Micro-polished journals with large radii help reduce friction.
Each crankshaft is stress relieved, shot peened, and 100% magnafluxed for quality assurance.
Designed for Chevrolet Small Block engine applications.

This crankshaft is designed for Chevrolet Small Block engines. 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

Forged from 4340 alloy steel, this Manley Pro Series crankshaft is built for serious performance in Chevrolet Small Block engines. The 3.875-inch stroke is a common choice for builders looking to increase displacement and torque, especially when paired with appropriate connecting rods and pistons. This isn't just a piece of steel; it's a carefully crafted component designed to handle the demands of a high-performance build.

Manley puts this crankshaft through a multi-step heat treatment and nitriding process, which significantly boosts its strength and resistance to wear, ensuring it stands up to repeated stress. The journals are micro-polished with large radii, a detail that helps reduce friction and improve overall engine efficiency. Before it leaves the factory, each crankshaft is stress relieved, shot peened for fatigue resistance, and 100% magnafluxed to catch any potential imperfections. This rigorous quality assurance means you're getting a well-built part ready for your project.

When building a performance engine, the crankshaft is the backbone. This Manley unit offers a solid foundation with its robust construction and attention to detail. Ensure you have the correct connecting rods, pistons, and balancing procedures in mind for your specific application, as these components work together to create a reliable and powerful engine.