Engines and Components› Pistons and Piston Rings

Eagle Specialty Products

355 CID Rotating Assembly

$2,783.97

SKU: EAG12029030

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Overview

The Eagle Specialty Products rotating assembly is a 355 CID kit for Small Block Chevy engines. It features a forged crank, forged pistons, a 3.480-inch stroke, and a 4.030-inch bore. This assembly includes 5.700-inch H-beam rods.
Show original supplier description
The Eagle Specialty Products 355 CID rotating assembly is designed for Small Block Chevy engines, offering a robust solution for performance applications. This kit includes a forged crankshaft and forged pistons, paired with 5.700-inch H-beam connecting rods. The assembly features a 3.480-inch stroke and a 4.030-inch bore, contributing to its 355 cubic inch displacement. Their crankshafts and connecting rods are thoroughly inspected to ensure suitability for demanding applications. This particular assembly is intended for serious performance builds, utilizing premium forged 4340 components. It is important to note that the assembly must be balanced by a qualified machine shop before use.

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

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandEagle Specialty Products
Part NumberEAG12029030
CategoryEngines and Components

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

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.

View Full Return Policy

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.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy