What is the horsepower rating for this rotating assembly?

This Manley rotating assembly is rated for up to 750 horsepower when used with ARP 8740 fasteners. For higher output builds, it can handle up to 1,500 horsepower with the optional ARP 2000 cap screws.

What materials are the crankshaft, rods, and pistons made from?

The crankshaft is constructed from lightweight 4340 forged steel. The connecting rods are Pro Series Lightweight I-Beam, and the pistons are from the Platinum Series, made of 2618 forged aluminum. All components are chosen for their strength in high-performance applications.

Does this rotating assembly come with everything needed for installation?

This kit includes the crankshaft, connecting rods with ARP 2000 cap screws, pistons, and premium wrist pins. It is a core rotating assembly, and you will need to source other engine components such as bearings, rings, gaskets, and fasteners not explicitly listed as included.

Specifications

Brand: Manley Performance
Part #: 290840
UPC: 807298071350

Manley Rotating Assembly, SBC 355 3.480 STROKE/-4cc FLAT

Name: Manley Rotating Assembly, SBC 355 3.480 STROKE/-4cc FLAT
Brand: Manley Performance
SKU: manley-performance-manley-rotating-assembly-sbc-355-3-480-stroke-4cc-flat-t14-881305
Price: 4535.48 USD
Availability: BackOrder

$4535.48

On Backorder

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

Manley Rotating Assembly, SBC 355 3.480 STROKE/-4cc FLAT. Built for high-horsepower builds.

Key Features

Fits Small Block Chevy (SBC) 355 engines with a 3.480-inch stroke.
Features a lightweight 4340 forged steel crankshaft for strength and reduced rotational mass.
Includes Pro Series Lightweight I-Beam connecting rods with 7/16-inch ARP 2000 cap screws.
Comes with 2618 forged aluminum Platinum Series pistons and Premium Chrome Moly wrist pins.
Rated for up to 750 horsepower with ARP 8740 fasteners.
Capable of handling 1,500 horsepower with optional ARP 2000 cap screws.

This rotating assembly is designed for Small Block Chevy (SBC) 355 engines with a 3.480-inch stroke. Please verify compatibility with your specific engine build.

⚠️ 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

Manley Performance is well-known for making strong internal engine components, and this rotating assembly is a prime example of their work. If you're building a high-performance Small Block Chevy (SBC) with a 355 cubic inch displacement and a 3.480-inch stroke, this kit is designed to handle serious power. It’s a complete package that gives you the core rotating parts needed to rebuild or upgrade your engine's bottom end.

At the heart of this assembly is a lightweight 4340 forged steel crankshaft, chosen for its strength and ability to withstand high RPMs and significant stress. Paired with this are Manley's Pro Series Lightweight I-Beam connecting rods. These rods are well-built and come equipped with 7/16-inch ARP 2000 cap screws, a popular choice for their reliability in demanding applications. The pistons are from Manley's Platinum Series, made from 2618 forged aluminum, and include Premium Chrome Moly wrist pins. This combination of materials and design is intended for engines making substantial horsepower.

This rotating assembly is rated for up to 750 horsepower when using ARP 8740 fasteners, and can handle an impressive 1,500 horsepower with the optional ARP 2000 cap screws, which are often a worthwhile upgrade for extreme builds. Keep in mind that this assembly is not CARB approved and cannot be shipped to California. It's a solid option for anyone looking to build a powerful SBC engine where durability and performance are key.