Engines and Components› Crankshafts and Components

Eagle Specialty Products

Forged 4340 Steel Crankshaft, 4.000" Stroke

$836.99

SKU: EAG435140006200

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In Stock
Ships by Sep 9
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$100 Minimum Order
30 Days Return
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Overview

The Eagle Specialty Products EAG435140006200 is a forged 4340 steel crankshaft designed for high-performance applications.

This crankshaft features a 4.000 in. stroke and internal balance. It is constructed from forged 4340 steel, undergoes a multi-stage heat-treatment process, and is stress-relieved and shot-peened for durability. The journals are precision-ground and micro-polished to less than 5 R.A., with .125 in. radius on rod and main journals for increased strength. It also includes chamfered oil holes for improved oiling and requires narrow bearings.
Show original supplier description
The Eagle Specialty Products Forged 4340 Steel Crankshaft is engineered for high-performance applications, offering superior strength and reliability. Constructed from premium forged 4340 steel, this crankshaft features a non-twist forging process and a multi-stage heat-treatment for enhanced durability. Key specifications include a 4.000 in. stroke, internal balance, and a standard snout style. The journals are precision-ground and micro-polished to less than 5 R.A., with .125 in. fillet radii on both rod and main journals to maximize strength. Oil holes are chamfered for improved lubrication, and the crankshaft requires narrow bearings. The target bob weight is within +/- 2 percent, significantly reducing balancing time. It is designed for Ford 351W engines and has a 5/8 in.-18 balancer bolt thread size. It is sold individually and is compatible with both 1-piece and 2-piece rear main seal configurations. Please note that this crankshaft requires balancing to match your specific rods and pistons.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandEagle Specialty Products
Part NumberEAG435140006200
CategoryEngines and Components

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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