Eagle Specialty Products 4″ Stroke 351W Steel Crankshaft for Ford

Description

Product Overview

The Eagle 4″ Stroke 351W Steel Crankshaft is a precision‑engineered component designed to replace or upgrade the factory crankshaft in small block Ford applications. Manufactured from high‑grade cast steel, the crankshaft delivers exceptional strength, fatigue resistance, and dimensional stability under high‑rpm operation. With a 4‑inch stroke and a 351‑watt power rating, it provides a noticeable increase in torque output while maintaining smooth engine rotation. The crankshaft weighs 56 pounds, offering a solid feel that contributes to overall engine balance and longevity.

Key specifications include a forged steel main journal, fully machined bearing surfaces, and a hardened oil pump drive. The design incorporates a full‑size counterweight on each rod journal to reduce vibration and improve harmonic balance. The component is finished with a protective coating to guard against corrosion during storage and installation. All dimensions conform to OEM standards, ensuring a direct fit without the need for additional machining or modification.

Usage

This crankshaft is intended for use in performance‑oriented builds, street‑legal hot rods, and classic restoration projects that require a reliable powertrain foundation. It excels in applications where increased stroke length translates to higher displacement and improved low‑to‑midrange torque, making it a popular choice for drag racing, autocross, and daily driving enthusiasts alike.

Installation is straightforward for anyone familiar with engine rebuilding. The crankshaft fits standard small block Ford engine blocks, including popular models such as the 302, 351, and 390. It pairs well with aftermarket connecting rods, high‑performance pistons, and forged bearings to create a complete high‑output assembly. The robust construction also tolerates higher compression ratios and aggressive camshaft profiles, allowing builders to extract maximum performance from their engine builds.

Why Choose Us

Eagle Specialty Products has a long history of delivering high‑quality performance components to the automotive aftermarket. Each crankshaft undergoes rigorous quality control testing, including magnetic particle inspection and dynamic balancing, to ensure it meets or exceeds industry standards. Our commitment to precision machining and material integrity means you receive a component that not only fits perfectly but also endures the stresses of high‑performance operation.

We stand behind our products with a comprehensive warranty and responsive customer support. Whether you need technical assistance during installation or guidance on selecting complementary parts, our knowledgeable team is ready to help. Additionally, our distribution network ensures fast shipping and reliable availability, so you can keep your build on schedule.

Key Features

• High‑grade cast steel construction for superior strength and durability
• 4‑inch stroke delivers increased displacement and torque output
• Precision‑balanced journals reduce vibration and improve engine smoothness
• Full‑size counterweights enhance harmonic balance for high‑rpm reliability
• Comprehensive warranty and expert technical support for peace of mind

FAQ

Is this crankshaft compatible with all small block Ford engines?

Yes, the Eagle 4″ Stroke 351W Steel Crankshaft is designed to fit standard small block Ford engine blocks, including 302, 351, and 390 cubic inch versions. It matches OEM dimensions, so no additional machining is required for a direct replacement.

What type of bearings should be used with this crankshaft?

We recommend using high‑performance forged steel or aluminum alloy bearings that are rated for the increased load and speed capabilities of the 351W crankshaft. Pairing the crankshaft with quality bearings ensures optimal longevity and performance.

Can this crankshaft be used in a street‑legal vehicle?

Absolutely. The crankshaft meets all emissions and durability standards for street use. When combined with appropriate tuning and supporting components, it provides a reliable and powerful driving experience while remaining legal for road use.

How does the weight of the crankshaft affect engine performance?

The 56‑lb weight contributes to a solid, well‑balanced rotating assembly, which helps dampen harmonic vibrations and improves overall engine smoothness. A heavier, well‑balanced crankshaft can also enhance durability under high‑load conditions, making it ideal for both performance and daily driving applications.

What warranty does Eagle Specialty Products offer on this crankshaft?

Eagle provides a limited warranty that covers material defects and workmanship for a specified period after purchase. Detailed warranty terms are included with the product documentation, and our customer service team is available to address any concerns.