Sale

Engines and Components› Pistons and Piston Rings

Eagle

4.250" Stroke Rotating Assembly Stroker Kit

$3,369.99 $2,899.95 Save $470.04

SKU: EAG-52505-4185

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Overview

The Eagle EAG-52505-4185 is a competition rotating assembly stroker kit designed for 428/455 blocks with a 4.250" stroke. This kit features a new forged crankshaft, Mahle -22cc dish top pistons, and 6.800" forged 4340 H-beam rods.

It includes plasma-moly file fit rings and performance main & rod bearings. Assemblies must be balanced prior to installation.
Show original supplier description
The Eagle EAG-52505-4185 is a high-performance rotating assembly stroker kit engineered for competition use. It is designed to work with 428 and 455 engine blocks, featuring a 4.250" stroke to create a 468 cubic inch displacement. This comprehensive kit includes a new forged 4340 steel crankshaft, forged 4340 H-beam connecting rods measuring 6.800" with ARP 8740 capscrew rod bolts, and Mahle -22cc dish top pistons. It also comes with plasma-moly file fit rings and performance racing bearings. It is crucial that all rotating assemblies are balanced prior to installation. Furthermore, assemblies balanced internally will necessitate a neutral balanced flexplate or flywheel and a harmonic balancer. All Eagle kits are supplied with file fit rings, which typically require filing to achieve the desired bore size. The ESP Armor surface finishing process is exclusive to Eagle and is applied to the rods and cranks. This process creates an incredibly slick surface, reducing bearing friction, lowering oil temperature, decreasing windage losses, and enhancing corrosion resistance, ultimately leading to longer bearing life. Eagle offers a one-year limited warranty against breakage when ESP Armor is used on any 4340 steel crankshaft or H-beam rod.

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
Part NumberEAG-52505-4185
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