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Engines and Components› Crankshafts and Components

Eagle Specialty Products

Cast Steel Crankshaft, 3.750" Stroke

$396.99 $354.97 Save $42.02

SKU: EAG104003750

In Stock
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 EAG104003750 is a cast steel crankshaft designed for Chevrolet Small Block 400 applications. It features a 3.750" stroke and a 2-piece rear main seal. This crankshaft is stronger and more durable than stock castings, making it a suitable option for performance, claimer, or stock replacement builds.
Show original supplier description
The Eagle Specialty Products EAG104003750 is a cast steel crankshaft engineered for Chevrolet Small Block 400 engines. This component offers enhanced strength and durability over factory castings, positioning it as an excellent choice for performance upgrades, claimer engines, or direct stock replacements. Eagle utilizes magnafluxing, sonic testing, and X-ray inspection to guarantee a reliable product. This crankshaft features a 3.750" stroke and is designed for a 2-piece rear main seal. It is externally balanced and includes 2.100" rod journals, with a specified rod length of 5.700" and up. The crankshaft snout size is 1.245". All radii are .092" to accommodate OE-style bearings. Key specifications include a cast steel construction, 400 main bearing type, and external engine balance. It does not include rod or main bearings, nor does it require narrow bearings. The manufacturer, Eagle, lists the part number as 104003750 and the weight as 55 lbs. It is sold as each and is noted to be OE spec balance. Additionally, the product states that all items are not for use in pollution-controlled vehicles.

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.

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Specifications

BrandEagle Specialty Products
Part NumberEAG104003750
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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