What is the horsepower rating for this rotating assembly?

With the standard 7/16" ARP 8740 cap screws, this assembly is rated for up to 750 horsepower. An optional upgrade to ARP 2000 cap screws increases the horsepower range to 1,500.

What is the difference between the standard and optional cap screws?

The standard 7/16" ARP 8740 cap screws are strong and suitable for many performance builds. The optional ARP 2000 cap screws offer increased tensile strength, allowing the assembly to handle significantly higher horsepower loads.

Specifications

Brand: Manley Performance
Part #: 290740RH
UPC: 807298080215

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-t14-881285
Price: 3463.81 USD
Availability: BackOrder

$3463.81

On Backorder

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

Manley Performance SBC 355 rotating assembly with 3.480" stroke. Features 4340 forged steel crank and rods for serious builds.

Key Features

The crankshaft is constructed from lightweight 4340 forged steel for strength.
Connecting rods are 4340 forged steel H-beam design with 7/16" ARP 8740 cap screws.
Pistons are 2618 forged aluminum Platinum Series with premium chrome moly wrist pins.
This assembly is designed for a Small Block Chevy (SBC) engine with a 3.480-inch stroke.
The flat-top pistons have a -4cc dish, contributing to a 355 cubic inch displacement.
With ARP 8740 cap screws, the assembly is rated for up to 750 horsepower.

This rotating assembly is designed for Small Block Chevy (SBC) engines. Check manufacturer specifications to confirm 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

Built from 4340 forged steel, the crankshaft in this Manley rotating assembly is designed to handle serious power. This assembly is specifically for a Small Block Chevy (SBC) engine, featuring a 3.480-inch stroke and -4cc flat-top pistons, creating a 355 cubic inch displacement. It’s a well-built foundation for a performance engine rebuild where strength and reliability are paramount.

The connecting rods are also made from 4340 forged steel in an H-beam design, a strong choice for high-RPM applications. They come equipped with 7/16-inch ARP 8740 cap screws, capable of handling up to 750 horsepower. If your build demands even more, you have the option to upgrade to ARP 2000 cap screws, which can support up to 1,500 horsepower. The pistons are Manley's own Platinum Series, forged from 2618 aluminum and include premium chrome moly wrist pins, ensuring they can withstand the rigors of a high-performance engine.

This rotating assembly is a significant step up from stock components, offering the durability and strength needed for modified engines. Keep in mind that this assembly is not CARB approved and cannot be shipped to California. It’s a robust package for builders looking to maximize the potential of their SBC engine.