What is the bore size and stroke for this rotating assembly?

This rotating assembly kit is designed for a 4.010-inch bore and features a 4.000-inch stroke crankshaft. This configuration results in a 403 cubic inch displacement, which can be further increased to 408 cubic inches with specific block preparation.

What type of bearings are included in this kit?

The kit includes King XP series rod and main bearings. These bearings are known for their durability and performance in high-stress engine applications.

Does this kit come with piston rings and connecting rod bolts?

Yes, this assembly includes plasma-moly file-fit piston rings and 7/16-inch ARP 8740 connecting rod bolts, ensuring a strong and reliable connection for the rods.

Specifications

Brand: Eagle
Part #: 129264010
UPC: 793348802930

Eagle Rotating Assembly Kit for Chevrolet/Pontiac LS-Series 403/408cu.in. - 4.010in Bore

Name: Eagle Rotating Assembly Kit for Chevrolet/Pontiac LS-Series 403/408cu.in. - 4.010in Bore
Brand: Eagle
SKU: eagle-eagle-rotating-assembly-kit-for-chevrolet-pontiac-ls-series-403-408cu-in-4-t14-4318179
Price: 3075.10 USD
Availability: BackOrder

$3075.10

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Eagle Rotating Assembly Kit for LS-Series 403/408cu.in. engines. Built with a forged 4340 crank and Mahle pistons for high-performance builds.

Key Features

Fits a wide range of Chevrolet and Pontiac LS-Series engines, including models like the Cadillac CTS, Chevrolet Camaro, and Pontiac GTO.
Features a 4.000-inch forged 4340 steel crankshaft for strength and durability.
Includes 6.125-inch H-beam connecting rods with 7/16-inch ARP 8740 bolts for reliable performance.
Comes with forged 4032 aluminum Mahle pistons with a -12cc inverted dome design and 4.010-inch bore size.
Equipped with plasma-moly file-fit piston rings for a customizable and effective seal.
Includes King XP rod and main bearings for robust lubrication and wear resistance.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

Starting with a 4.000-inch forged 4340 crankshaft is key for any serious LS-series engine build, and this Eagle rotating assembly kit centers around that solid foundation. This kit is designed for 403 or 408 cubic inch displacements with a 4.010-inch bore, making it a popular choice for those looking to step up their Chevrolet or Pontiac performance, whether it's for track use or street driving.

You'll find 6.125-inch H-beam connecting rods included, which are strong enough for demanding applications and come equipped with 7/16-inch ARP 8740 bolts to ensure they stay securely fastened under stress. The pistons are forged 4032 aluminum from Mahle, featuring a -12cc inverted dome design that works well with various cylinder head combinations to achieve your target compression ratio. They also come with plasma-moly file-fit rings, giving you flexibility during installation to achieve a perfect seal. To round out the assembly, King XP rod and main bearings are included, known for their durability and performance in high-stress environments.

This kit is a comprehensive package for rebuilding or significantly upgrading your LS-series engine. It's important to note that this assembly is not CARB approved and cannot be shipped to California. Always consult your engine builder or refer to the manufacturer's detailed installation instructions for proper assembly and tuning procedures to get the most out of this high-performance rotating assembly.