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Engines and Components› Pistons and Piston Rings

Eagle

SBC Rotating Assembly Kit - 3.480" Stroke, 4.030" Bore

$2,935.68 $2,668.80 Save $266.88

SKU: EAG12004030

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$100 Minimum Order
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Overview

The EAGLE SBC Rotating Assembly Kit is a competition-grade kit for Small Block Chevy engines. This kit includes a forged crank, forged pistons, and H-beam rods with a 3.480 in stroke and 4.030 in bore. It is designed for 355 CID engines.
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The EAGLE SBC Rotating Assembly Kit - Competition (Part # 12004030) is engineered for high-performance Small Block Chevy applications. This comprehensive kit features a forged crankshaft and forged pistons, paired with robust 6.000 in H-beam connecting rods. With a stroke of 3.480 inches and a bore of 4.030 inches, this assembly is designed to build a powerful 355 cubic inch displacement (CID) engine. This rotating assembly is a crucial component for engine builders looking to enhance performance and durability. The use of forged components signifies a commitment to strength and reliability under demanding conditions, making it suitable for competitive use. The kit provides a balanced foundation for engine builds requiring precision and robust internals.

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
Part NumberEAG12004030
CategoryEngines and Components
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

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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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