What is the benefit of a forged 4340 alloy steel crankshaft?

Forged 4340 alloy steel is significantly stronger and more durable than cast iron or other materials. This makes the crankshaft more resistant to bending, cracking, and fatigue under high stress, which is crucial for performance engines.

How does the 3.850-inch stroke affect engine performance?

A longer stroke, like the 3.850 inches on this crankshaft, increases the engine's displacement. This generally leads to more torque and horsepower, especially at lower RPMs, by allowing for a larger volume of air and fuel mixture to be burned with each combustion cycle.

What does micro-polishing the journals achieve?

Micro-polishing the journals creates an extremely smooth surface finish. This reduces friction between the crankshaft and the connecting rod bearings, leading to less heat buildup, improved oil flow, and potentially a slight increase in overall engine efficiency and longevity.

Specifications

Brand: Manley Performance
Part #: 190330
UPC: 807298089812

Manley Ford 351 Cleveland Forged Crankshaft - 3.850in Stroke

Name: Manley Ford 351 Cleveland Forged Crankshaft - 3.850in Stroke
Brand: Manley Performance
SKU: manley-performance-manley-ford-351-cleveland-forged-crankshaft-3-850in-stroke-t14-880859
Price: 1559.64 USD
Availability: BackOrder

$1559.64

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Manley Ford 351 Cleveland Forged Crankshaft - 3.850in Stroke. Built from forged 4340 steel for improved strength and performance.

Key Features

Fits Ford 351 Cleveland engines.
Manufactured from forged 4340 alloy steel for enhanced strength and longevity.
Features a 3.850-inch stroke to increase engine displacement.
Lightened rod journals and profiled counterweights ensure precise balance and optimized performance.
Undergoes multi-step heat treatment and nitriding for improved strength and wear resistance.
Large radius journals are micro-polished to reduce friction and enhance performance.

⚠️ 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 crankshaft is built to handle serious performance builds for your Ford 351 Cleveland engine. The 3.850-inch stroke is a significant increase over stock, allowing you to increase your engine's displacement and unlock more power potential, especially when paired with a larger bore. This isn't just about making it bigger; it's about making it stronger and more reliable for demanding applications.

Manley has incorporated several features to ensure this crankshaft performs and lasts. The rod journals are lightened, and the counterweights are fully profiled for precise balance, which helps reduce vibration and stress on the engine. To further enhance its durability, the crankshaft undergoes a multi-step heat treatment process and nitriding, making it much stronger and more resistant to wear. The journals themselves are large radius and micro-polished, which cuts down on friction, allowing for smoother operation and improved performance.

Before it leaves the factory, each crankshaft is put through rigorous quality checks, including stress relief, shot peening, and 100% magnafluxing, ensuring it meets Manley's high standards for strength and integrity. If you're looking to build a high-performance Ford 351 Cleveland with increased displacement and a crankshaft that's built to last, this is a solid option.